Probable Cause for Disobeying a School Traffic Direction Defeats Both Fourth Amendment and Retaliatory-Arrest Claims; “Nieves” Exception Requires Objective, Contextual Comparators

1. Introduction

Lambert v. City of Onalaska (5th Cir. July 13, 2026) arises from a contentious elementary-school drop-off encounter between parent Amberley Lambert and school resource officer Tammie Heeth. Lambert alleged that Officer Heeth unlawfully seized and arrested her (Fourth Amendment) and arrested her in retaliation for complaining to the assistant principal two days earlier (First Amendment). Lambert also sued the City of Onalaska under 42 U.S.C. § 1983, asserting municipal responsibility for the officer’s conduct.

The central appellate issues were whether Lambert produced evidence of a constitutional violation sufficient to defeat qualified immunity at summary judgment and, specifically:

  • whether Officer Heeth had probable cause (or at least reasonable suspicion) to stop Lambert’s vehicle and probable cause to arrest her; and
  • whether Lambert could proceed on a retaliatory arrest theory despite the existence of probable cause by fitting within the narrow exception described in Nieves v. Bartlett.

2. Summary of the Opinion

The Fifth Circuit affirmed summary judgment for Officer Heeth and the City. The court held:

  • Officer Heeth “seized” Lambert when she used physical force against the vehicle (striking it) and again when Lambert was arrested, but both seizures were reasonable under the Fourth Amendment because Heeth had probable cause.
  • Probable cause existed to stop and arrest Lambert for willfully failing or refusing to comply with a lawful order or direction of a police officer under Tex. Transp. Code Ann. § 542.501(1) when Lambert continued driving after being signaled to stop and turn around.
  • Lambert’s conduct during the encounter also supplied probable cause for resisting arrest under Tex. Penal Code Ann. § 38.03(a).
  • Lambert’s First Amendment retaliatory arrest claim failed because probable cause generally bars such claims under Nieves v. Bartlett, and Lambert did not produce the objective, contextual comparator evidence required to invoke the Nieves exception.
  • Because no underlying constitutional violation was shown, the City faced no § 1983 liability on Lambert’s theory.

3. Analysis

3.1. Precedents Cited

Summary judgment and qualified immunity framework

  • Aguirre v. City of San Antonio, 995 F.3d 395 (5th Cir. 2021) and Joseph ex rel. Est. of Joseph v. Bartlett, 981 F.3d 319 (5th Cir. 2020): The panel reiterated de novo review and the obligation to view facts and inferences in the nonmovant’s favor at summary judgment.
  • Brown v. Callahan, 623 F.3d 249 (5th Cir. 2010): Once qualified immunity is invoked, the burden shifts to the plaintiff to show a genuine issue that the official violated clearly established law. The court relied on this burden-shifting posture to assess whether Lambert had shown a constitutional violation at all.
  • Guzman v. Allstate Assurance Co., 18 F.4th 157 (5th Cir. 2021): In a footnote, the court used Guzman to correct a key factual misstep below—Lambert’s “self-serving” testimony that she did not hit the officer was competent summary judgment evidence. The Fifth Circuit therefore assumed (for qualified immunity analysis) Lambert did not hit Officer Heeth.
  • Sauceda v. City of San Benito, 78 F.4th 174 (5th Cir. 2023): Cited both for harmless-error principles on appeal (footnote) and substantively for the rule that an initially unlawful arrest cannot be justified retroactively by resistance. The panel distinguished Sauceda because the arrest here was lawful at inception due to independent probable cause.

Fourth Amendment seizure, traffic stops, and probable cause

  • United States v. Brigham, 382 F.3d 500 (5th Cir. 2004) (en banc): Provided the core rule that a traffic stop is a Fourth Amendment seizure and must be justified by probable cause or reasonable suspicion. The court treated the “hit to the vehicle” as a traffic-stop seizure.
  • District of Columbia v. Wesby, 583 U.S. 48 (2018): Cited for the proposition that an arrest is a seizure and must be reasonable.
  • Atwater v. City of Lago Vista, 532 U.S. 318 (2001): Under Atwater, a warrantless arrest is permitted for even very minor offenses committed in an officer’s presence if probable cause exists. This supported the conclusion that § 542.501(1) could support arrest.
  • United States v. Castro, 166 F.3d 728 (5th Cir. 1999) (en banc) (per curiam): Supplied the Fifth Circuit’s standard definition of probable cause under the totality of circumstances.
  • Devenpeck v. Alford, 543 U.S. 146 (2004): Used to reject Lambert’s argument that probable cause fails because she was not charged with § 542.501(1). Under Devenpeck, the officer’s subjective reason and the eventual charging decision do not control if objective facts establish probable cause for any offense.

Probable cause for resisting arrest under Texas law

  • Ramirez v. Martinez, 716 F.3d 369 (5th Cir. 2013): The panel relied on Ramirez’s survey of Texas authority: pulling out of an officer’s grasp can constitute resisting arrest. Lambert’s testimony that she tensed her body to prevent removal supported probable cause.
  • Benfer v. City of Baytown, 120 F.4th 1272 (5th Cir. 2024), cert. denied, 145 S. Ct. 1313 (2025): Reinforced that repeatedly pulling out of an officer’s grasp can supply probable cause for resisting arrest.

First Amendment retaliatory arrest and the probable cause bar

  • Hartman v. Moore, 547 U.S. 250 (2006): Cited for the general principle that the First Amendment prohibits retaliatory government action for protected speech.
  • Mt. Healthy City School District Board of Education v. Doyle, 429 U.S. 274 (1977): The court described Mt. Healthy’s causation/burden-shifting framework but emphasized that retaliatory arrest claims must first overcome the probable-cause hurdle imposed by Nieves before Mt. Healthy becomes relevant.
  • Nieves v. Bartlett, 587 U.S. 391 (2019): The decisive authority: plaintiffs must plead and prove absence of probable cause for retaliatory arrest claims, subject to a narrow exception when objective evidence shows similarly situated individuals not engaged in the protected speech were not arrested in circumstances where officers typically exercise discretion not to arrest.
  • Gonzalez v. Trevino, 602 U.S. 653 (2024) (per curiam): The court used Gonzalez to clarify that Nieves’s exception does not require “virtually identical and identifiable comparators,” but the evidence must remain objective and contextual. It also relied on Gonzalez (including Justice Alito’s concurrence) to explain why “negative evidence” (e.g., “no one else has been arrested”) can be weak where the plaintiff’s conduct is novel rather than endemic.

3.2. Legal Reasoning

(a) The Fourth Amendment: two seizures, both reasonable

The panel first identified two seizures: (1) the officer’s use of physical force against the vehicle (striking it) to stop it, and (2) the arrest. Having assumed Lambert did not strike the officer (per the footnote), the court nonetheless held probable cause existed.

Probable cause for failure/refusal to comply with a lawful order (§ 542.501(1)). The court emphasized undisputed facts: Lambert was on an improper route; Officer Heeth signaled Lambert to stop and turn around; Lambert paused and then continued driving toward the officer as the officer approached. Objectively, those facts allowed a reasonable officer to conclude Lambert “willfully fail[ed] or refuse[d] to comply with a lawful order or direction of a police officer.” Lambert’s asserted misunderstanding of the hand signal did not matter because probable cause is objective.

Probable cause for resisting arrest (§ 38.03(a)). Even if the initial basis were debated, Lambert’s own testimony that she “tense[d her] body up” to prevent removal supported probable cause that she obstructed the officer’s effort to effect an arrest by using force (as Texas law can treat pulling away/physical resistance as force). The court thus treated resistance as additional, independent probable cause—without using it to bootstrap an otherwise unlawful arrest.

Distinguishing Sauceda v. City of San Benito. The court squarely confronted Lambert’s reliance on Sauceda, which prohibits curing an unlawful arrest with resistance that occurs moments later. The court’s distinction was doctrinal: because there was already probable cause under § 542.501(1) before any resistance, the arrest was lawful when initiated; resistance merely added another basis, rather than retroactively validating the arrest.

Charging decisions are irrelevant (Devenpeck v. Alford). Lambert was not charged with § 542.501(1), but the court held that does not undermine probable cause; an arrest is valid if probable cause exists for any offense supported by the known facts.

(b) The First Amendment: probable cause defeats retaliatory arrest absent a Nieves-exception showing

Because the court found probable cause, Lambert’s retaliatory arrest claim faced the Nieves rule: probable cause generally defeats retaliatory arrest claims. Lambert therefore needed to fit within Nieves’s “narrow qualification” by producing objective evidence that similarly situated non-complainers were not arrested in comparable circumstances where arrest is usually discretionary and uncommon.

Lambert’s evidence was primarily:

  • Officer Heeth’s admission that Lambert was the only person she had arrested for disregarding the drop-off route or traffic direction; and
  • the close timing between Lambert’s complaint to the assistant principal and the arrest.

The panel rejected both as insufficient for the Nieves exception:

  • “Only arrest” evidence lacked contextual comparators. Using Gonzalez’s context-focused approach, the court found Lambert’s behavior was not “endemic but rarely results in arrest” like jaywalking (Nieves’s example). The panel characterized the conduct as serious and atypical—driving toward an officer after a lawful stop/turn-around signal—making the absence of other arrests weak “negative evidence.”
  • Timing evidence belongs to Mt. Healthy, not Nieves. The court treated temporal proximity as potentially relevant to retaliatory motive under Mt. Healthy, but held it cannot substitute for the objective comparator-type evidence needed to pass through the Nieves gateway. Otherwise, Mt. Healthy would become redundant.

(c) Municipal liability (City of Onalaska)

The opinion affirmed summary judgment for the City on the reasoning that Lambert failed to establish an underlying constitutional violation by Officer Heeth. On that record and theory, the City could not be liable under § 1983.

3.3. Impact

  • School traffic enforcement as a probable-cause anchor. The decision underscores that disobeying on-scene traffic directions by a school resource officer can supply probable cause for stop and arrest under Tex. Transp. Code Ann. § 542.501(1), even if the eventual prosecution focuses on other offenses.
  • Clarifies the Sauceda boundary. The case illustrates how defendants can avoid Sauceda by identifying a pre-resistance offense supporting probable cause at the moment the arrest begins. For plaintiffs, it highlights the strategic importance of contesting whether any lawful-arrest predicate existed before resistance.
  • Raises the evidentiary bar for the Nieves exception in “novel conduct” settings. By treating Lambert’s conduct as unlike “endemic minor offenses,” the panel signaled that “no one else has been arrested” evidence will often be inadequate absent context showing the offense is commonly tolerated and arrests are atypical.
  • Separates “gateway” proof from motive proof in retaliatory arrest claims. The opinion’s insistence that temporal proximity is irrelevant until the Nieves exception is satisfied will shape summary judgment briefing: plaintiffs must first marshal objective evidence of differential enforcement before litigating motive under Mt. Healthy.

4. Complex Concepts Simplified

  • Qualified immunity: A doctrine protecting government officials from damages unless the plaintiff shows both (i) a constitutional violation and (ii) that the right was clearly established at the time. Practically, it changes who must produce what evidence at summary judgment.
  • Seizure: Under the Fourth Amendment, a person is “seized” when an officer restrains liberty through physical force or a show of authority. Stopping a vehicle is a seizure of both the car and its occupants.
  • Reasonable suspicion vs. probable cause: Reasonable suspicion is a lower threshold that can justify a brief stop; probable cause is a higher threshold that can justify an arrest. Here, the court concluded probable cause existed for both the stop and the arrest.
  • Devenpeck rule (charge mismatch): An arrest can be lawful even if the officer cites the “wrong” offense or prosecutors charge different crimes later, so long as objective facts at the scene established probable cause for some offense.
  • Nieves exception (objective comparator evidence): Even with probable cause, a retaliatory arrest claim can proceed only if the plaintiff shows—through objective evidence— that others who did the same thing (but did not engage in the protected speech) were typically not arrested, indicating discretionary enforcement was used punitively.
  • Mt. Healthy test (motive and same-decision defense): If the plaintiff clears the initial hurdles, she must show retaliation was a motivating factor; the defendant can still win by showing she would have taken the same action anyway. The opinion stressed you do not reach Mt. Healthy in a retaliatory arrest case unless the Nieves gateway is first satisfied.

5. Conclusion

Lambert v. City of Onalaska reaffirms that where an officer has objective probable cause—here, for failing to comply with a lawful traffic direction and for resisting arrest—Fourth Amendment claims fail and qualified immunity applies. It also tightens the practical operation of the Nieves v. Bartlett framework in the Fifth Circuit: a plaintiff with probable cause must present objective, contextual evidence of differential enforcement to invoke the narrow Nieves exception, and temporal proximity evidence of retaliatory motive cannot substitute for that threshold showing. The result is a decision that, while unpublished, offers a clear roadmap for litigating probable cause and the Nieves exception in retaliatory arrest cases arising from discretionary, on-the-ground policing decisions.