no one said barry cooper as of yet...??? http://nevergetbusted.com/2010/
basically, most every plastic is semi-permeable... super small molecules/ions can work their way through the plastic... microscopic holes. it takes time, but it will happen. the way the dog smells, is that it identifies each & every odor molecule... they have sensitivity & resolution in smelling. so, if you do multiple layers, and give it enough time to seep through... then the dog will smell plastic, vaseline, febreeze, body oils, more plastic, and then the weed. this is all from the video series.
also, as people have noted, you can get a dog to respond... falsely. basically, they take dogs with super strong bite instincts & train them with treats... the dog recognizes an odor & associates it with getting his/her favorite treat or toy. the dog has incentive to positively identify. pretty easy for a handler to get this response... it's not for the weed, it's for the treat/toy.
basically, most every plastic is semi-permeable... super small molecules/ions can work their way through the plastic... microscopic holes. it takes time, but it will happen. the way the dog smells, is that it identifies each & every odor molecule... they have sensitivity & resolution in smelling. so, if you do multiple layers, and give it enough time to seep through... then the dog will smell plastic, vaseline, febreeze, body oils, more plastic, and then the weed. this is all from the video series.
also, as people have noted, you can get a dog to respond... falsely. basically, they take dogs with super strong bite instincts & train them with treats... the dog recognizes an odor & associates it with getting his/her favorite treat or toy. the dog has incentive to positively identify. pretty easy for a handler to get this response... it's not for the weed, it's for the treat/toy.