Cite as: 534 U. S. 266 (2002)
Opinion of the Court
still facing forward, put their hands up at the same time and began to wave at Stoddard in an abnormal pattern. Id., at 35, 61. It looked to Stoddard as if the children were being instructed. Their odd waving continued on and off for about four to five minutes. Id., at 35, 73.
Several hundred feet before the Kuykendall Cutoff Road intersection, the driver signaled that he would turn. Id., at 36. At one point, the driver turned the signal off, but just as he approached the intersection he put it back on and abruptly turned north onto Kuykendall. The turn was significant to Stoddard because it was made at the last place that would have allowed the minivan to avoid the checkpoint. Id., at 37. Also, Kuykendall, though passable by a sedan or van, is rougher than either Rucker Canyon or Leslie Canyon Roads, and the normal traffic is four-wheel-drive vehicles. Id., at 36, 63-64. Stoddard did not recognize the minivan as part of the local traffic agents encounter on patrol, id., at 37, and he did not think it likely that the minivan was going to or coming from a picnic outing. He was not aware of any picnic grounds on Turkey Creek, which could be reached by following Kuykendall Cutoff all the way up. Id., at 54. He knew of picnic grounds and a Boy Scout camp east of the intersection of Rucker Canyon and Leslie Canyon Roads, id., at 31, 53, 54, but the minivan had turned west at that intersection. And he had never seen anyone picnicking or sightseeing near where the first sensor went off. Id., at 53, 75.
Stoddard radioed for a registration check and learned that the minivan was registered to an address in Douglas that was four blocks north of the border in an area notorious for alien and narcotics smuggling. Id., at 37-38, 66-67. After receiving the information, Stoddard decided to make a vehicle stop. Id., at 38. He approached the driver and learned that his name was Ralph Arvizu. Stoddard asked if respondent would mind if he looked inside and searched
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