Dogs may not have been trained for marijuana. If you're looking for coke or heroin mules you don't want your dog to alert every time a college student walks by. Dog may not have been trained for drugs at all. At airports I'm pretty sure a lot of the dogs are for explosives, not drugs.
MaidenPilled t1_je10evr wrote
Reply to comment by al_pacappuchino in N.Y. to pay $5.5 million to man exonerated in writer Alice Sebold rape case by OutsideObserver2
Dogs may not have been trained for marijuana. If you're looking for coke or heroin mules you don't want your dog to alert every time a college student walks by. Dog may not have been trained for drugs at all. At airports I'm pretty sure a lot of the dogs are for explosives, not drugs.