sniff

There are lot of rumots about it, but actually there are substances they cannot smell or no dog is trained to smell. Who knows which chemicals are sure to be detected by dogs?

Hello, I have searched, that dogs can sniff the drugs even if they are hiding well. I was thinking about how dealers sending their stuff via postal mail without getting caught? and what going to happen if the postal office caught the drugs won't that be high risky for the dealer to identify...