Can police use dogs to sniff cars for drugs when they don’t have a warrant?

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Can a police officer who stops a motorist for a traffic violation have a police dog sniff around the car for illegal substances such as drugs?


The United States Supreme Court has ruled that people do not have a "reasonable expectation" of privacy in the smell of one's automobile (or one's luggage). For that reason, police use of a sniffer dog does not constitute a search. In other words, even if a police officer has no reason to believe that a car contains an illegal substance, the officer can use a trained “sniffer dog” to check for illegal substances. Any illegal substances that the officer finds with the dog’s help can be used against the motorist at trial (Illinois v. Caballes, U.S. Sup. Ct. 2005).


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