814
Opinion of the Court
ard they have put forward—whether the officer's conduct deviated materially from usual police practices, so that a reasonable officer in the same circumstances would not have made the stop for the reasons given—is an "objective" one.
But although framed in empirical terms, this approach is plainly and indisputably driven by subjective considerations. Its whole purpose is to prevent the police from doing under the guise of enforcing the traffic code what they would like to do for different reasons. Petitioners' proposed standard may not use the word "pretext," but it is designed to combat nothing other than the perceived "danger" of the pretextual stop, albeit only indirectly and over the run of cases. Instead of asking whether the individual officer had the proper state of mind, the petitioners would have us ask, in effect, whether (based on general police practices) it is plausible to believe that the officer had the proper state of mind.
Why one would frame a test designed to combat pretext in such fashion that the court cannot take into account actual and admitted pretext is a curiosity that can only be explained by the fact that our cases have foreclosed the more sensible option. If those cases were based only upon the evidentiary difficulty of establishing subjective intent, petitioners' attempt to root out subjective vices through objective means might make sense. But they were not based only upon that, or indeed even principally upon that. Their principal basis—which applies equally to attempts to reach subjective intent through ostensibly objective means—is simply that the Fourth Amendment's concern with "reasonableness" allows certain actions to be taken in certain circumstances, whatever the subjective intent. See, e. g., Robinson, supra, at 236 ("Since it is the fact of custodial arrest which gives rise to the authority to search, it is of no moment that [the officer] did not indicate any subjective fear of the [arrestee] or that he did not himself suspect that [the arrestee] was armed") (footnotes omitted); Gustafson, supra, at 266 (same). But even if our concern had been only an evidentiary one,
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