No. 25-1142

Appeal from the United States District Court for the District of Colorado (D.C. No. 1:23-CV-01241-CNS-SBP)

Hollie R. Birkholz (Julia A. Bannon, with her on the briefs), Office of the Aurora City Attorney, Aurora, Colorado, for Defendant-Appellant.

Zachary D. Warren, Highlands Law Firm, Denver, Colorado, for PlaintiffAppellee.

Before McHUGH , CARSON , and ROSSMAN , Circuit Judges.

ROSSMAN , Circuit Judge.

Page 2Plaintiff-Appellee Wyoma Martinez was attacked by Defendant Douglas Harroun (Officer Harroun), a City of Aurora police officer. When the attack occurred, Officer Harroun was on administrative leave. Ms. Martinez filed a civil rights lawsuit in federal district court under 42 U.S.C. § 1983 against Officer Harroun and his employer Defendant-Appellant City of Aurora, Colorado (Aurora). Aurora moved to dismiss, arguing the complaint failed to plausibly allege § 1983’s state-action requirement. The district court denied Aurora’s motion to dismiss and its motion to reconsider the denial. We then granted Aurora's petition to hear this interlocutory appeal. Exercising jurisdiction under 28 U.S.C. § 1292(b), we reverse the denial of the motion to reconsider and remand for further proceedings consistent with this opinion.

On December 31, 2022, Douglas Harroun, an officer with the Aurora Police Department, shot and severely injured an individual while on duty.

Page 3The next day, Aurora’s chief of police placed Officer Harroun on administrative leave (Leave Order).² The Leave Order stated, in relevant part, “You are being placed on administrative leave. You will not take any action as a sworn police officer, nor are you allowed to work any secondary employment or wear your police uniform.'³ RI.125. Officer Harroun signed the Leave Order.

A little over a week later, Officer Harroun was involved in another violent incident. On the evening of January 11, 2023, Officer Harroun and

You are being placed on administrative leave. You will not take any action as a sworn police officer, nor are you allowed to work any secondary employment or wear your police uniform.

Page 4his wife drove into the parking lot of his apartment complex and saw Ms. Martinez, a resident of the same complex, walking her dog. Officer Harroun drove near Ms. Martinez and became upset when she failed to move out of his way. Officer Harroun “quickly accelerated towards” Ms. Martinez and nearly struck her before 'slamming on his brakes right next to her, . . . effectively trapping her between his vehicle and [a] row of parking garages[.]” RI.188 (¶ 28). He then got out of his car and began to berate Ms. Martinez. Ms. Martinez threatened to call police. Officer Harroun replied, “Go ahead, I’m a cop.” RI.188 (¶ 30). It is undisputed Officer Harroun was not wearing his police uniform. He then provided his badge number.

Page 5After Ms. Martinez warned Officer Harroun she had pepper spray, he grabbed her wrist, slammed her to the ground, and 'punch[ed] her approximately four or five times in the face and throat while pinning her to the ground[.]” RI.190 (¶¶ 45–46). Officer Harroun then reidentified himself as a police officer, produced his badge, told Ms. Martinez “numerous times” she was under arrest for “assaulting a peace officer,” and said she would be going to jail. RI.190–91 (¶ 47). Officer Harroun explained to Ms. Martinez and eyewitnesses that he was “just trying to disarm her and detain her[.]” RI.191 (¶ 52).

Later that evening, Officer Harroun was arrested for unjustified use of force and charged with first-degree assault by strangulation, Colo. Rev. Stats. § 18-3-202(1)(g); attempting to influence a public servant, id. § 18-8306; and third-degree assault, id. § 18-3-204(1)(a). Because of the attack, Ms. Martinez suffered a traumatic brain injury, vision loss, and significant mental and emotional distress, among other issues.

B

Ms. Martinez sued Aurora and Officer Harroun under 42 U.S.C. § 1983, alleging violations of her rights under the Fourth and Fourteenth Amendments and the Colorado Constitution. The complaint pleaded one claim against Aurora for “failure to hire, investigate, train, supervise, and discipline.' RI.229 (bolding and capitalization altered). The complaint also Page 6pleaded four claims against Officer Harroun: excessive force in violation of the Fourth Amendment, false arrest in violation of the Fourth Amendment, excessive force in violation of the Colorado Constitution, and denial of equal protection in violation of the Colorado Constitution. The complaint alleged that, during the incident on January 11, 2023, Officer Harroun acted pursuant to Aurora’s policy for off-duty officers—namely, Aurora Directive 14.4 (Off-Duty Policy). According to the complaint, the Off-Duty Policy states that “[s]worn members confronted with an off-duty situation must use discretion and good judgment in deciding if direct participation is necessary as opposed to summoning an on-duty police officer.” RI.182.

Aurora moved to dismiss under Federal Rule of Civil Procedure 12(b)(6) for failure to state a claim. Aurora argued the complaint did not plausibly allege Officer Harroun was acting under color of state law—an element of a § 1983 claim. According to Aurora, the Leave Order had revoked Officer Harroun’s actual authority to act as a sworn Aurora police officer.⁴ That is, 'when an officer has no [actual] authority to act for the police department,” Aurora contended, then that officer has not acted under color of law. RI.247.

Page 7Ms. Martinez insisted her allegations satisfied the under-color-of-law requirement. “[T]he standard for whether an officer acts under color of law,” she said, 'is not whether the officer has actual authority from his employer to take action.” RI.282 (citing Jojola v. Chavez , 55 F.3d 488, 493 (10th Cir. 1995)). In her view, “either actual or apparent” authority could establish the under-color-of-law element. RI.282 (quoting Jojola , 55 F.3d at 493). Because Officer Harroun at least had apparent authority to act as an Aurora police officer during the incident, Ms. Martinez argued, Officer Harroun necessarily acted under color of law.

While the motion to dismiss was pending for decision, Aurora submitted a notice of supplemental authority about Lindke v. Freed , 601 U.S. 187 (2024). There, the Supreme Court clarified the under-color-of-law element requires a § 1983 plaintiff to show the official “had actual authority to speak on behalf of the State on a particular matter[.]” Lindke , 601 U.S. at 204 (emphasis added). 'If the plaintiff cannot make this threshold showing of [actual] authority,” the Court explained, “he cannot establish state action.” Lindke , 601 U.S. at 201. Relying on Lindke , Aurora urged the district court to reject Ms. Martinez’s arguments that apparent authority alone could satisfy the under-color-of-law element. Because Aurora “took every necessary step to strip [Officer] Harroun of his authority to act under color of law before the incident,' the City reasoned, it 'cannot fairly be Page 8blamed for his conduct even if he believed he was acting as a police officer” and regardless of “how he presented himself.” RII.313.

The district court denied Aurora's motion to dismiss (MTD Order). The district court did not cite Lindke . Instead, it relied on Dry v. City of Durant , 242 F.3d 388 (10th Cir. 2000) (unpublished), which it read to supply four “factors” for determining whether an off-duty officer acts under color of law: (1) 'actual authority,' (2) 'objective indicia of authority,' (3) 'the victim’s perception of the encounter,” and (4) “the defendant’s belief as to whether he was acting under color of law.” RII.323 (quoting Dry , 242 F.3d 388, at *4). Applying Dry to the allegations in Ms. Martinez’s complaint, the district court determined Officer Harroun “had no actual authority to act as a police officer' on the night of the attack. RII.329. The district court explained

The first factor of the Dry analysis, actual authority, favors the City. The City argues that Defendant Harroun was not acting under color of law when he attacked Ms. Martinez because he was an administratively suspended officer, not merely an offduty officer, and so he did not have any actual authority to act. The Court agrees. He was explicitly advised, in the administrative leave memorandum that he signed, “You will not take any action as a sworn police officer.”

RII.324 (internal citations omitted). Still, in the district court’s view, Ms. Martinez had plausibly pleaded Officer Harroun acted with apparent authority. The district court concluded “acting with apparent authority can Page 9be sufficient” to establish state action under § 1983. RII.324. On that basis, the district court determined, 'Plaintiff has sufficiently alleged that Defendant Harroun was acting under color of law to survive the motion to dismiss.” RII.329.

Aurora moved for reconsideration. It again pointed to Lindke , which clarified only actual authority—not apparent authority—could satisfy the state-action requirement. Aurora insisted, in light of Lindke , the district court had erroneously concluded Officer Harroun could act “under color of law” despite lacking actual authority.

The district court denied the reconsideration motion and refused to dismiss the complaint. But the Reconsideration Order departed from the MTD Order in two significant ways. First, the district court now relied on and applied Lindke . Second, although Ms. Martinez's complaint was unchanged, the district court newly concluded Ms. Martinez did plausibly plead Officer Harroun had “actual authority” to “use force when performing police duties” at the time of the incident. RII.398.

In support of its conclusion, the district court pointed to allegations that Aurora had a custom of allowing officers on administrative leave to retain their badges. A police badge “is itself a form of delegated authority,” the court said, “because it symbolizes the authority that a person has to act as a police officer.” RII.398. The district court also found Ms. Martinez had Page 10pleaded that Aurora maintained the Off-Duty Policy, which 'plausibly grants some actual authority for officers on leave to still act as officers.” RII.398. Because Ms. Martinez had plausibly pleaded Officer Harroun “subjectively believed that he was acting pursuant to the off-duty directive,” the district court explained, his subjective belief “is plausible evidence of the scope of the grant of actual authority.” RII.398. Thus, the court said, “ Lindke does not change the Court's conclusion that Defendant Harroun was plausibly acting under color of law[.]” RII.399.

This timely appeal followed.⁵

There is one dispositive issue in this interlocutory appeal: Did Ms. Martinez plausibly allege Officer Harroun acted “under color of law” when he assaulted her on January 11, 2023? For the reasons that follow, we must answer no . We first set out our standard of review and describe the principles relevant to the disposition of this appeal, clarifying what Lindke requires of plaintiffs suing under § 1983. With these principles in mind, we then analyze the pleadings and address the parties’ arguments, explaining Page 11why Ms. Martinez has failed to plausibly allege the state-action requirement.

Two standards of review apply to this appeal. Recall, in the MTD Order, the district court denied Aurora’s motion to dismiss under Rule 12(b)(6). And in the Reconsideration Order, the district court concluded that denial was proper. Aurora moved to certify the Reconsideration Order for interlocutory appeal.

“[W]e review the district court’s denial of a motion for reconsideration for abuse of discretion.” United States v. Warren , 22 F.4th 917, 927 (10th Cir. 2022) (internal quotation marks omitted). “A district court by definition abuses its discretion when it makes an error of law[.]” Floyd v. Ortiz , 300 F.3d 1223, 1227 (10th Cir. 2002) (internal quotation marks omitted). 'A complaint's legal sufficiency is a question of law[.]' Stark v. Reliance Standard Life Ins. Co. , 142 F.4th 1252, 1256 (10th Cir. 2025). Accordingly, a district court abuses its discretion when its denial of reconsideration depends on an incorrect conclusion about the legal sufficiency of a complaint. See Obeslo v. Empower Cap. Mgmt., LLC , 85 F.4th 991, 1004–05 (10th Cir. 2023) ('[W]hen the district court's exercise of [ ] discretion depended on the resolution of a purely legal issue, we review that issue de Page 12novo.' (alteration in original) (internal quotation marks omitted)). To determine whether the district court abused its discretion in denying reconsideration based on the complaint’s legal sufficiency, then, we must review de novo whether the pleadings sufficiently state a claim for relief. See Alvarado v. KOB-TV, L.L.C. , 493 F.3d 1210, 1215 (10th Cir. 2007) (“We review de novo a district court's decision on a Rule 12(b)(6) motion for dismissal for failure to state a claim.”).

A complaint must contain “only enough facts to state a claim to relief that is plausible on its face.” Bell Atl. Corp. v. Twombly , 550 U.S. 544, 570 (2007). “A claim is plausible when the complaint contains ‘factual content that allows the court to draw the reasonable inference that the defendant is liable for the misconduct alleged.’” Chilcoat v. San Juan County , 41 F.4th 1196, 1207 (10th Cir. 2022) (quoting Ashcroft v. Iqbal , 556 U.S. 662, 678 (2009)). We assess plausibility by reading plaintiff's allegations 'in the context of the entire complaint.” Id. (internal quotation marks omitted).

Section 1983 provides a cause of action against “[e]very person who, under color of any statute, ordinance, regulation, custom, or usage, of any State[,]” deprives someone of a federal constitutional or statutory right. 42 U.S.C. § 1983. “The two elements of a Section 1983 claim are (1) deprivation of a federally protected right by (2) an actor acting under color of state law.”Page 13 Schaffer v. Salt Lake City Corp. , 814 F.3d 1151, 1155 (10th Cir. 2016). This appeal concerns the under-color-of-law element, also known as the “state action' requirement. See Lindke , 601 U.S. at 195 n.1 ('Because local governments are subdivisions of the State, actions taken under color of a local government’s law, custom, or usage count as ‘state’ action for purposes of § 1983.”).

“The traditional definition of acting under color of state law requires that the defendant in a § 1983 action have exercised power ‘possessed by virtue of state law and made possible only because the wrongdoer is clothed with the authority of state law.'' West v. Atkins , 487 U.S. 42, 49 (1988) (quoting United States v. Classic , 313 U.S. 299, 326 (1941)). The state-action requirement thus precludes § 1983 liability for “merely private conduct, no matter how discriminatory or wrongful[.]' Am. Mfrs. Mut. Ins. Co. v. Sullivan , 526 U.S. 40, 50 (1999) (quoting Blum v. Yaretsky , 457 U.S. 991, 1002 (1982)). “The purpose of this requirement is to assure that constitutional standards are invoked only when it can be said that the State is responsible for the specific conduct of which the plaintiff complains.' Brokers’ Choice of Am., Inc. v. NBC Universal, Inc. , 757 F.3d 1125, 1143 (10th Cir. 2014) (quoting Blum , 457 U.S. at 1004). State action does not exist when state officials act 'in the ambit of their personal pursuits[.]' Hall Page 14v. Witteman , 584 F.3d 859, 866 (10th Cir. 2009) (quoting Screws v. United States , 325 U.S. 91, 111 (1945) (plurality opinion)).

The Supreme Court recently addressed the state-action requirement in Lindke v. Freed. There, the Court considered whether a city official's activity on social media occurred 'under color of law' to support a First Amendment claim under § 1983. See Lindke , 601 U.S. at 190-91. The official, James Freed, was the city manager of Port Huron, Michigan. For years, Mr. Freed maintained a public Facebook page where he posted prolifically about both his personal life and his job. His profile picture showed himself in a suit with a city lapel pin. Mr. Freed frequently engaged with readers, answering inquiries from residents and replying to comments. During the COVID-19 pandemic, Port Huron resident Kevin Lindke was unhappy with the city's approach to the pandemic and voiced his displeasure on Mr. Freed’s Facebook page. Mr. Freed deleted the comments and eventually blocked Mr. Lindke from commenting. Mr. Lindke sued under § 1983, alleging Mr. Freed had violated his First Amendment rights. The district court granted summary judgment to Mr. Freed, concluding he had not acted in a public capacity in managing his Facebook page. The Sixth Circuit affirmed, concluding there was no state action.

The Supreme Court reversed. The question before the Court was “whether a state official engaged in state action or functioned as a private Page 15citizen.” Id. at 196 (emphasis omitted). As the Court acknowledged, this “question is difficult, especially in a case involving a state or local official who routinely interacts with the public[,]” because “[s]uch officials may look like they are always on the clock, making it tempting to characterize every encounter as part of the job.” Id. The Court began with the plain language of the statute. 'As its text makes clear,' § 1983 'protects against acts attributable to a State, not those of a private person.” Id. at 194. “In the run-of-the-mill case,” the Court explained, “state action is easy to spot.” Id. at 195. But '[s]ometimes . . . the line between private conduct and state action is difficult to draw.” Id. After all, the Court said, state officials “have private lives and their own constitutional rights.' Id. at 197. To balance these interests, the Court announced a two-part test: State action for purposes of § 1983 exists only if an individual '(1) possessed actual authority” to take a particular action on the state’s behalf and “(2) purported to exercise that authority[.]” Id. at 198.

This appeal concerns the “first prong of this test”: actual authority. Id. Determining whether an individual possessed actual authority to take a particular action “demands a fact-intensive inquiry.” Id. at 197. A court must first assess the “ specific conduct of which the plaintiff complains.'⁶ Id.

Page 16at 199 (emphasis added) (quoting Blum , 457 U.S. at 1004). And then a court must determine “the scope of an official’s power[.]” Id. at 200. The Supreme Court has instructed that the scope of such power will depend on its source—that is, a “statute, ordinance, regulation, custom, or usage[,]” as listed in the text of § 1983. See id. at 200 (quoting 42 U.S.C. § 1983). “To be clear,” the Court cautioned, “the ‘[ m ] isuse of power, possessed by virtue of state law,' constitutes state action.' Id. at 199 (alteration in original) (quoting Classic , 313 U.S. at 326). 'To misuse power, however, one must possess it in the first place.' Id. at 200. Put differently, state action will not exist if the conduct at issue falls outside the scope of the officer's actual authority. See id. at 198–99 (explaining state action does not exist if “the challenged conduct ‘entail[s] functions and obligations in no way dependent on state authority’” (alteration in original) (quoting Polk County v. Dodson , 454 U.S. 312, 318–19 (1981))).

The upshot is, after Lindke , apparent authority does not suffice to show state action. State action for purposes of § 1983 exists only if an individual acted with “actual authority” to engage in the “specific conduct” of which the plaintiff complains. Id. at 198-99 (internal quotation marks omitted); see also Haulmark v. City of Wichita , No. 22-3243, 2024 WLPage 17 3219677, at *8 (10th Cir. June 28, 2024) (unpublished) (remanding for the district court to apply Lindke ’s two-prong test). To the extent this circuit’s cases have sometimes suggested otherwise, those statements of law are no longer correct after Lindke . See, e.g. , David v. City & County of Denver , 101 F.3d 1344, 1353 (10th Cir. 1996) (“The defendant’s authority may be actual or apparent.'); Jojola , 55 F.3d at 493 ('The authority with which the defendant is allegedly clothed may be either actual or apparent.” (internal quotation marks omitted)); Dry , 242 F.3d 388, at *4–5 (finding “the officers did not act pursuant to actual state authority,” yet proceeding to analyze “under color of state law” via four “factors”); Rogers v. Brown , No. 24-8075, 2025 WL 1157195, at *2 (10th Cir. Apr. 21, 2025) (unpublished) ('The authority with which the defendant is allegedly 'clothed' may be either actual or apparent.” (quoting Jojola , 55 F.3d at 493)). The Sixth Circuit on remand similarly acknowledged Lindke 's effect on its own precedent. See Lindke v. Freed , 114 F.4th 812, 816 (6th Cir. 2024) (“[W]e previously held that actual or apparent authority could support a finding of state action. But the Supreme Court made clear that only actual authority could suffice.” (citation omitted)).

Page 18To better understand Lindke ’s test, common-law agency principles are instructive.⁷ We have endorsed the Restatement’s approach to an agent’s authority. See Restatement (Third) of Agency §§ 2.01–.03 (2006). “Actual authority requires the agent’s ‘reasonabl[e] belie[f], in accordance with the principal’s manifestations to the agent, that the principal wishes the agent to so act.'' Coreslab Structures (TULSA), Inc. v. NLRB , 100 F.4th 1123, 1136 (10th Cir. 2024) (alterations in original) (emphasis omitted) (quoting Restatement (Third) of Agency § 2.01). 'Lack of actual authority is established by showing either that the agent did not believe , or could not reasonably have believed, that the principal's grant of actual authority encompassed the act in question.” 1-800 Contacts, Inc. v. Lens.com, Inc. , 722Page 19 F.3d 1229, 1251 (10th Cir. 2013) (emphasis removed) (quoting Restatement (Third) of Agency § 2.02 cmt. e).

“[A]n agent’s actual authority to do something is terminated when the principal revokes it.” Fucci v. First Am. Title Ins. Co. , 153 F.4th 1129, 1145 (10th Cir. 2025). And a revocation becomes “effective when the other party has notice of it.' Id. (quoting Restatement (Third) of Agency § 3.10(1)). What remains of the agent’s authority post-revocation depends on how “the agent reasonably understands the principal’s manifestations and objectives when the agent determines how to act.” Restatement (Third) of Agency § 2.02(1); see also id. § 1.03 (stating a manifestation can be “written or spoken words or other conduct”). “[I]n no event must [the agent] act contrary to what he reasonably believes the principal desires him to do.' Fucci , 153 F.4th at 1145 (alteration in original) (quoting Restatement (Second) of Agency § 33 cmt. a (1958)).

We now consider whether Ms. Martinez has plausibly alleged state action under § 1983. Aurora contends the complaint does not plausibly allege that, when he attacked Ms. Martinez, Officer Harroun had actual authority to use force or conduct arrests because he was on administrative leave. We agree.

Following the approach in Lindke , we start by determining the 'specific conduct' of which Ms. Martinez complains. Lindke , 601 U.S. at 199 (quoting Blum , 457 U.S. at 1004). At the motion-to-dismiss stage, the 'specific conduct' at issue turns on the well-pleaded allegations in the complaint. See Waller v. City & County of Denver , 932 F.3d 1277, 1286 n.1 (10th Cir. 2019) (explaining, at the motion-to-dismiss stage, a court considers only allegations within 'the four corners of the complaint'); Children’s Health Def. v. Meta Platforms, Inc. , 112 F.4th 742, 754–55 (9th Cir. 2024) (considering, in a postLindke case at the motion-to-dismiss stage, only the complaint’s allegations to determine the “specific conduct”). Here, the parties do not dispute the specific conduct at issue. Officer Harroun

• · identified himself as a police officer to Ms. Martinez;
• · provided his badge number and displayed his badge; and
• · used force to try to disarm, detain, and arrest her.

See RI.188, 190-91 (¶¶ 31-33, 46-47). Ms. Martinez has consistently claimed this specific conduct amounted to “the most quintessential of law enforcement activities[.]' Resp. Br. at 7; see Resp. Br. at 17, 22–23 (similar). In her operative complaint, she describes Officer Harroun’s conduct during the incident as “official police action,” RI.194 (¶ 72), performed “pursuant Page 21to his authority as a certified police officer' and 'in accordance with his duties' to Aurora, RI.182-83. And in her response to Aurora's motion to dismiss, Ms. Martinez argued Officer Harroun acted “[c]onsistent with his general law enforcement duties' RI.283.⁸ Ms. Martinez takes the same position on appeal. “[T]here is no doubt,” she says, that Officer Harroun’s actions 'map directly onto the core functions of his work as a law enforcement officer” and “were clearly within his ‘bailiwick’ as an officer employed by the City of Aurora.” Resp. Br. at 19, 22 (quoting Lindke , 601 U.S. at 199).

We thus turn to the heart of the dispute about state action. Did Ms. Martinez plausibly allege Officer Harroun 'possessed actual authority'? Lindke , 601 U.S. at 198. She did not.

According to the complaint, Officer Harroun identified himself as a police officer; provided his badge number; and displayed his badge. He allegedly said at the scene, “I’m arresting a lady who tried to pepper spray Page 22me.” RI.192 (¶ 59). He told Ms. Martinez she was under arrest, not free to leave, and would be physically subdued if she did not comply with orders. RI.192. And he allegedly told responding officers he “was just trying to do [his] job.' RI.195 (¶ 73). Based on these allegations, Ms. Martinez has plausibly pleaded only that Officer Harroun believed he had authority to engage in his specific conduct during the incident.

But Ms. Martinez has failed to plausibly plead Officer Harroun had actual authority. The complaint alleged Officer Harroun was on administrative leave at the time of the incident. The Leave Order instructed him to 'not take any action as a sworn police officer[.]' RI.125; see Restatement (Third) of Agency § 2.02 cmt. c ('[T]he formality of the statement itself is relevant to, and often dispositive of, whether the agent could reasonably believe that the principal intended to consent to the agent's power to do acts beyond or other than those stated in the instrument.'). Yet Officer Harroun's specific conduct during the incident consisted of the very activities the Leave Order expressly forbade. See Lindke , 601 U.S. at 199–200 (explaining a court must consider the official’s 'specific conduct' in light of 'the scope of [the] official's power' (internal quotation marks omitted)); Restatement (Third) of Agency § 2.02 cmt. e (viewing the objective reasonableness of the agent’s belief as to the scope of their authority “from the viewpoint of a reasonable person in the agent’s Page 23situation under all of the circumstances of which the agent has notice”). Ms. Martinez has failed to plausibly plead it was objectively reasonable for an officer told to “not take any action as a sworn police officer” to nevertheless believe he had authority to undertake 'quintessential police activities[.]' Resp. Br. at 22; see Matney v. Barrick Gold of N. Am. , 80 F.4th 1136, 1147 (10th Cir. 2023) (affirming the dismissal of a complaint because plaintiffs had 'not create[d] a plausible inference' to support their claim (quoting Matousek v. MidAmerican Energy Co. , 51 F.4th 274, 280 (8th Cir. 2022))); see also Twombly , 550 U.S. at 570 (explaining a complaint 'must be dismissed” if it has not “nudged the[] claims across the line from conceivable to plausible”).

Because Ms. Martinez has failed to plausibly plead 'this threshold showing of authority, [s]he cannot establish state action[,]” and her § 1983 claim against Aurora fails as a matter of law. Lindke , 601 U.S. at 201; see, e.g. , Hall , 584 F.3d at 867 (dismissing § 1983 claim because “the complaint fail[ed] to allege state action'). We therefore agree with Aurora that the district court erred in denying its motion to dismiss the claim.⁹

Page 24Ms. Martinez presents several counterarguments, but none are availing.

First , Ms. Martinez insists Officer Harroun “was acting under color of state law' because he 'subjectively believed he was acting as a law enforcement officer, and Ms. Martinez and eyewitnesses understood him to be acting in that role.” Resp. Br. at 18. This argument misunderstands the law. The Supreme Court clarified in Lindke that an individual cannot “conjure the power of the State through his own efforts.” Lindke , 601 U.S. at 199. Actual authority requires the agent have both a subjective belief and an objectively reasonable belief that he could do the specific act at issue. See 1-800 Contacts, Inc. , 722 F.3d at 1251. Officer Harroun's subjective belief alone cannot establish state action. Further, the beliefs of third parties such as Ms. Martinez relate to apparent authority, not actual authority. See Coreslab Structures , 100 F.4th at 1136 (“Apparent authority Page 25turns on a third party’s reasonable belief that the agent ‘has authority to act on behalf of the principal and that belief is traceable to the principal’s manifestations.'' (emphasis omitted) (quoting Restatement (Third) of Agency § 2.03)). Apparent authority alone does not satisfy the state-action requirement. See Lindke , 601 U.S. at 198.

Second , Ms. Martinez argues her pleadings plausibly establish Officer Harroun retained actual authority from a “policy” of Aurora’s—specifically, the Off-Duty Policy. Recall, Ms. Martinez alleges that Officer Harroun “was on administrative leave at the time” of the attack but remained “subject to . . . the Off-Duty [Policy].” RI.202 (¶ 111). According to her complaint, the Off-Duty Policy requires '[s]worn members confronted with an off-duty situation' to 'use discretion and good judgment in deciding if direct participation is necessary as opposed to summoning an on-duty police officer.” RI.182. Ms. Martinez argues the Off-Duty Policy applied to Officer Harroun while he was on leave, meaning he retained “some level of actual authority” during the incident. Resp. Br. at 26. We are not persuaded.

To be sure, the district court found the Off-Duty Policy “ambiguous as to whether it applies to officers who are on leave[.]” RII.398. We disagree. Read alongside the Leave Order, the Off-Duty Policy is not 'reasonably susceptible to more than one meaning[.]” Pirkheim v. First Unum Life Ins. , 229 F.3d 1008, 1010 (10th Cir. 2000) (internal quotation marks omitted). As Page 26Aurora points out, the Off-Duty Policy applies only to “ [s]worn members .” RI.182 (emphasis added). The Leave Order instructed Officer Harroun to “not take any action as a sworn police officer [.]” RI.125 (emphasis added). Reading the allegations in Plaintiff’s favor, as we must at the motion-todismiss stage, Ms. Martinez fails to plausibly allege the Off-Duty Policy even applied to Officer Harroun during his administrative leave.

Third , Ms. Martinez argues Officer Harroun had actual authority because he was allowed to keep his badge. Aurora's custom of allowing officers to keep their badge while on leave, Ms. Martinez argues, indicates “some level of actual authority.” Resp. Br. at 26. But even if Officer Harroun could keep his badge, the Leave Order unambiguously terminated his authority to use it. Again, the Leave Order instructed him to 'not take any action as a sworn police officer[.]' RI.125 (emphasis added). That broad revocation of authority rendered objectively unreasonable Officer Harroun’s belief he could use the badge as he did during the incident—to effectuate detention and arrest using force.¹⁰

Page 27Fourth and finally, Ms. Martinez seems to argue for an alternativegrounds affirmance. She contends, even if the pleadings do not plausibly allege Officer Harroun acted under color of law, Aurora 'itself is the state actor and its action in maintaining the alleged policy at issue supplies the 'color of law' requirement under § 1983.' Resp. Br. at 36 (bolding and italicization omitted) (quoting Gibson v. City of Chicago , 910 F.2d 1510, 1520 (7th Cir. 1990)). Although Ms. Martinez raised this argument at the district court, see RI.291-92, the district court did not rule on it. This argument therefore presents a basis for affirmance different than the one adopted by the district court. Ms. Martinez does not acknowledge the difference, and she cites no cases laying out the factors that guide our discretion whether to affirm on alternative grounds. Resp. Br. at 34–37; see, e.g. , Elkins v. Comfort , 392 F.3d 1159, 1162 (10th Cir. 2004) (setting forth factors that guide our discretion to affirm on an alternative ground). 'Arguments inadequately briefed in the opening brief are waived[.]' 11Page 28 Adams v. FAA , 168 F.4th 1271, 1285 (10th Cir. 2026) (internal quotation marks omitted); see Tachias v. Sanders , 130 F.4th 836, 843 (10th Cir. 2025) (explaining the Federal Rules of Appellate Procedure require an appellee’s brief to include “citations to the authorities” on which the appellee relies (quoting Fed. R. App. P. 28(a)(8)(A))). We thus 'decline to reach any potential alternative grounds to affirm not ruled on by the district court.” Parker Excavating, Inc. v. Lafarge W., Inc. , 863 F.3d 1213, 1225 n.13 (10th Cir. 2017).¹² Because the district court did not address Ms. Martinez's argument that Aurora itself is the state actor for purposes of her § 1983Page 29 claim, we leave that argument for the district court to consider on remand. See Pac. Frontier v. Pleasant Grove City , 414 F.3d 1221, 1238 (10th Cir. 2005) (“Where an issue has been raised, but not ruled on, proper judicial administration generally favors remand for the district court to examine the issue initially.”).

We REVERSE the district court’s denial of the motion to reconsider and REMAND for further proceedings consistent with this opinion.