Generally, the investigative procedure of subjecting luggage to a "sniff test" by a trained police dog does not constitute a search in violation of the Fourth Amendment.

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The U.S. Supreme Court has ruled that the use of a trained police dog to sniff luggage or vehicles in public places for illegal substances does not constitute a search under the Fourth Amendment, as it does not involve an intrusion into a person's reasonable expectation of privacy.

Generally, the Investigative Procedure of Subjecting Luggage to a "Sniff