i dont really know, i know this for a fact though, one of my friends' fathers is a cop for D.C. he is in the S.O.D. and has a drug dog, which lives with them. And while the dog isnt on duty is at their house, i have gone into their house, with weed, rather stinky weed at that, in my pocket of my pants, and been in their house, and even petted their dog, while high, after smoking for several days in the same pants, and it acted normal, and i know that it wasnt told to do what it does, but still, dont you think that it would have given some sign? But ive also been drug searched, and my car, when i have had no weed on me, and even before i started smoking, so cops are just assholes in general.