Police stop a driver for a broken taillight and, while writing the citation, a K-9 unit arrives and conducts a dog sniff that prolongs the stop by ten minutes. Absent reasonable suspicion of drug activity, the sniff is:
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A
Constitutional, because a dog sniff is not a search under the Fourth Amendment
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B
Constitutional, because ten minutes is a de minimis intrusion
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C
Unconstitutional, because extending a traffic stop to conduct a dog sniff requires independent reasonable suspicion
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D
Unconstitutional, because dog sniffs always require a warrant