Police stop a driver for a broken taillight and, without any additional suspicion, extend the stop 20 minutes to wait for a drug-sniffing dog. Under Rodriguez v. United States, the resulting dog alert and search are:
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A
Unconstitutional, because prolonging a stop beyond its mission requires independent reasonable suspicion
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B
Constitutional, because a dog sniff is not a search under the Fourth Amendment
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C
Constitutional, because the initial stop was lawful
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D
Unconstitutional only if the delay exceeded 30 minutes