Cite as: 519 U. S. 33 (1996)
Opinion of the Court
of the vehicle without violating the Fourth Amendment's
proscription of unreasonable searches and seizures").
We now turn to the merits of the question presented. We have long held that the "touchstone of the Fourth Amendment is reasonableness." Florida v. Jimeno, 500 U. S. 248, 250 (1991). Reasonableness, in turn, is measured in objective terms by examining the totality of the circumstances.
In applying this test we have consistently eschewed bright-line rules, instead emphasizing the fact-specific nature of the reasonableness inquiry. Thus, in Florida v. Royer, 460 U. S. 491 (1983), we expressly disavowed any "litmus-paper test" or single "sentence or . . . paragraph . . . rule," in recognition of the "endless variations in the facts and circumstances" implicating the Fourth Amendment. Id., at 506. Then, in Michigan v. Chesternut, 486 U. S. 567 (1988), when both parties urged "bright-line rule[s] applicable to all investigatory pursuits," we rejected both proposed rules as contrary to our "traditional contextual approach." Id., at 572-573. And again, in Florida v. Bostick, 501 U. S. 429 (1991), when the Florida Supreme Court adopted a per se rule that questioning aboard a bus always constitutes a seizure, we reversed, reiterating that the proper inquiry necessitates a consideration of "all the circumstances surrounding the encounter." Id., at 439.
We have previously rejected a per se rule very similar to that adopted by the Supreme Court of Ohio in determining the validity of a consent to search. In Schneckloth v. Bustamonte, 412 U. S. 218 (1973), it was argued that such a consent could not be valid unless the defendant knew that he had a right to refuse the request. We rejected this argument: "While knowledge of the right to refuse consent is one factor to be taken into account, the government need not establish such knowledge as the sine qua non of an effective consent." Id., at 227. And just as it "would be thoroughly impractical to impose on the normal consent search the detailed requirements of an effective warning," id., at 231, so too would it be
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