In a decision issued on May 21, 2026, the United States District Court for the District of Arizona addressed significant questions regarding the First Amendment rights of off-duty peace officers who engage in political expression and counter-protest activities. Although the court denied the plaintiffs’ request for a preliminary injunction that would have ordered the reinstatement of Sergeant Dusten Mullen to paid administrative leave, it delivered a detailed and favorable analysis of the merits of his First Amendment retaliation claim.
Sergeant Mullen, a Phoenix Police Department supervisor, went to Hamilton High School on January 30, 2026, to check on his son and remained to counter-protest an anti-ICE student demonstration. He was off duty, out of uniform, and did not identify himself as a law enforcement officer. He wore a face covering together with a T-shirt that read “Trump 2024,” which the court recognized as symbolic speech addressing the salient political issue of immigration enforcement. Sergeant Mullen also recorded his interactions with the student protestors and with responding officers, an activity the court held was protected under the well-established First Amendment right to film matters of public interest in public places. Student protestors surrounded him, shouted curses, and threw water on him. He reported the incident to a Chandler police officer and out of frustration commented about allowing students to assault him.
The video evidence and sequence of events later established that Sergeant Mullen’s remark to the Chandler officer reflected frustration with the limited police response rather than any encouragement of assault. The Phoenix Police Department’s Professional Standards Bureau initially classified the matter as a Class II violation that would not result in termination. After media reports surfaced in April 2026 and Phoenix City Councilwoman publicly criticized his off-duty conduct and questioned his continued employment, the investigation abruptly changed course. The lead investigator was directed to elevate the violation to Class III, to sustain an additional allegation without new factual findings, and to complete the report on an accelerated schedule despite repeated requests for more time. A pre-dsiciplinary hearing was held on May 11, 2026, and termination followed three days later. The court found this timeline, together with the investigator’s testimony describing unprecedented pressure and departures from normal procedure, sufficient to support the inference that Sergeant Mullen’s protected activity was a substantial or motivating factor in the adverse employment action.
The court held that Sergeant Mullen engaged in protected First Amendment activity as a private citizen on matters of public concern. It stressed that speech addressing police competency and core political questions such as immigration enforcement occupies the highest rung of First Amendment values. Defendants failed to carry their burden of demonstrating either an adequate justification for treating Sergeant Mullen differently from other members of the public or that they would have reached the same termination decision absent the protected conduct. Their predicted disruption rested on speculation and negative publicity rather than evidence of actual or imminent workplace interference. The court emphasized that core First Amendment speech by an off-duty employee requires a particularly vigorous showing of disruption. The video did not evidence any intent to provoke a crime and the administrative investigation did not support termination prior to the media publicity. The court therefore concluded that the plaintiff demonstrated a strong likelihood of success on the merits of the First Amendment retaliation claim.
Nevertheless, the court found that Sergeant Mullen had not established irreparable injury sufficient to grant a preliminary injunction. Rather, the court hled that monetary damages or back pay awarded in the ordinary course of litigation can compensate any loss of income. The court noted that the public announcement of his termination had already occurred and the requested relief would not thaw the chilling effect on other officers. It therefore denied the motion for a temporary restraining order and preliminary injunction.
Although the court denied injunctive relief, the court’s favorable treatment of the underlying First Amendment retaliation claim bolsteres the protections afforded public employees. This case confirms that generalized or speculative predictions of disruption will not suffice, particularly where the speech addresses matters of core political concern and occurs off duty. The ruling further cautions agencies against allowing external political pressure or media attention to drive investigative findings without independent evidentiary support.
The decision reinforces the importance of distinguishing between legitimate operational concerns and content-based objections to an officer’s political views. It further underscores that policies governing off-duty conduct and social media must be narrowly tailored and applied consistently, lest they become vehicles for viewpoint discrimination. The underlying litigation remains ongoing with an appeal pending of the denial of preliminary injunctive relief.
