One of the most dangerous exercises that have flowed over from the sporting world into law enforcement is called the Bark & Hold. I call it the Bark & Die. There are many such exercises one can see on the sporting field. This is a very, very stupid exercise to bring to the street. Many officers and sporting enthusiasts will ask, "What if it is an unarmed child we are pursuing and the dog bites this suspect?" I will tell you that with proper training of handler and dog, this will never happen.
For a dog to approach an armed suspect with adrenaline flowing and a weapon in his hand, and then to sit and bark at him is telling the officer to approach. I know of several cases where the officer and the dog have been shot. That is why I call it the bark and die. A dog can and will distinguish between a weapon and non-weaponed hand. It takes training and communication, unlike the bark and die which takes programming.
When we program a dog we stop his ability and desire to think. The word think means he can make a conscious decision. Many trainers do not believe this. They believe they must program the dog to function. If this were true, we would not be facing the multitude of problems we have on the streets today. The ball, the towel tug, the sleeve are all aids in programming a dog. In fact these so-called aids actually diminish the dogs desire to think, because he is being praised and rewarded for being goofy.