How humane is it???


So all over the US there are rules and regulations for how to treat pets and animals. Is it still humane when using dogs on narcotic searches? They put the drugs in the dog toys and the dog plays with it. If they can smell it, I’m sure some of it gets out and gets in contact with the animal so wouldn’t that make them like a doggie addict?! Please correct me if I’m wrong. I was just watching a cop show with the dogs (narcotic unit). This is not to make people feel bad about their jobs or anything. I get that having a police dog can help, Just confused on how the entire humane and inhumane work. Like if someone was smoking marijuana and blowing it into the dogs face or the dog eats some crack that’s clearly bad, but it’s okay for them to play with dog toys laced with crack and heroine?!?