These dogs are trained to do this. The men being attacked are decoys.as for the cop getting nailed, those are the risks, the cop put HIS hand down by the dogs face the dog did not turn to attack. these dogs have that drive BORN into them they are not beat to become that way. They love what they do. Before you jump on me,I have seen them trained that is how I know. They are some of the most LOVING dogs.