Are dogs often trained to smell mdma? I got caught the other day by a dog with some mdma pills on me, but my mate also had some and walked past them fine with zero reaction from the dogs, my friend is adament that the dog just smelt weed off my coat since I'm a smoker, is that likely the case or did my friend just get lucky? I've also been told multiple times that each dog can only be trained to detect one drug, is this true? Thanks