Yep -- that's exactly what they do. And if the cop doesn't like you, he prompts the dog into a fake "alert." I don't know about anyone else, but I want our Constitution back.
Cool, a voice of sanity amid all the legalese and bureaucratic BS. Is there anyone out there that really thinks dogs can sniff a joint inside luggage from 30 meters or can differentiate illegal bodies from legal ones or detect child porn (yes, they really ran news stories on this). If so there's a bridge in Brooklyn I want to sell you for really cheap.