I would also recommend to anyone that is not a trainer or has had years of experience with handling dogs not to get one that could be used for the police as they are usually what they call high prey and would not be the best for the everyday dog owner. These dogs have a different job than the normal everyday dog. It is their business to do police work.
My nephew has a bomb sniffing dog (Air Force) that lives with him, his wife and two small children. He is a wonderful patient dog who plays with the kids without showing aggression. Is there a difference in their training that makes a drug sniffing dog police dog more hostile than a military dog?