At the same time, there are substantial arguments that Hartman’s framework is inapt in retaliatory arrest cases, and that Mt. Healthy should apply without a threshold inquiry into probable cause. For one thing, the causation problem in retaliatory arrest cases is not the same as the problem identified in Hartman. Hartman relied in part on the fact that, in retaliatory prosecution cases, the causal connection between the defendant’s animus and the prosecutor’s decision to prosecute is weakened by the “presumption of regularity accorded to prosecutorial decisionmaking.” 547 U.S., at 263. That presumption does not apply in this context. See Reichle, supra, at 669. In addition, there is a risk that some police officers may exploit the arrest power as a means of suppressing speech. See Brief for Institute for Free Speech as Amicus Curiae.
IV
The parties’ arguments raise difficult questions about the scope of First Amendment protections when speech is made in connection with, or contemporaneously to, criminal activity. But whether in a retaliatory arrest case the Hartman approach should apply, thus barring a suit where probable cause exists, or, on the other hand, the inquiry should be governed only by Mt. Healthy is a determination that must await a different case. For Lozman’s claim is far afield from the typical retaliatory arrest claim, and the difficulties that might arise if Mt. Healthy is applied to the mine run of arrests made by police officers are not present here.
Here Lozman does not sue the officer who made the arrest. Indeed, Lozman likely could not have maintained a retaliation claim against the arresting officer in these circumstances, because the officer appears to have acted in good faith, and there is no showing that the officer had any knowledge of Lozman’s prior speech or any motive to arrest him for his earlier expressive activities.
