As I said, they respond heavily to their handlers signals. Basically the cops can give someone an odd look and the dog will go and sit next to them. The false

As I said, they respond heavily to their handlers signals. Basically the cops can give someone an odd look and the dog will go and sit next to them. The false positive rate for drug dogs can be as high as 80%. That's not really any better than just randomly guessing. Also, people who take public transport tend to be lower-income.