IL: Traffic stops, even with PC, are governed by Terry

A traffic stop, even with PC to believe that a traffic offense occurred, is governed by Terry. People v. Cosby, 231 Ill. 2d 262, 898 N.E.2d 603325 Ill. Dec. 556 (2008):

Nonetheless, this court and many other courts have analyzed traffic stops under Terry principles, regardless of whether the initial stop was supported by probable cause or reasonable suspicion. See, e.g., People v. Gonzalez, 204 Ill. 2d 220, 789 N.E.2d 260, 273 Ill. Dec. 360 (2003) (and cases cited therein); People v. Bunch, 207 Ill. 2d 7, 796 N.E.2d 1024, 277 Ill. Dec. 658 (2003).

In Gonzalez, this court applied Terry principles to a traffic stop during which a police officer requested identification from the defendant, who was a passenger in the stopped vehicle. Citing Berkemer, we noted that, because the usual traffic stop is more analogous to a Terry investigative stop than to a formal arrest, a fourth amendment challenge to the reasonableness of a traffic stop is analyzed under Terry principles. A Terry analysis involves a dual inquiry: (1) whether the officer’s action was justified at its inception, and (2) whether the action was reasonably related in scope to the circumstances that justified the interference in the first place. Gonzalez, 204 Ill. 2d at 228-29. We concluded that the officers’ stop of the vehicle was supported by probable cause. Thereafter, we set forth an analytical framework to use in determining whether police questioning during a traffic stop violates the fourth amendment. First, with respect to Terry‘s scope requirement, a court must determine whether the questioning is related to the initial justification for the stop. If the questioning is so related, no fourth amendment violation occurs. If the questioning is not reasonably related to the purpose of the stop, the court must determine whether the officer had a reasonable, articulable suspicion that would justify the questioning. If so, there is no fourth amendment violation. In the absence of a reasonable, articulable suspicion, the court must consider whether, in light of the totality of the circumstances, the questioning impermissibly prolonged the detention or changed the fundamental nature of the stop. Gonzalez, 204 Ill. 2d at 235.

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