That actually happened to the brother in law of a friend of mine. They didn't shoot him. The guy was a real paranoid, fear the cops and black helicopters kind of guy. Police stopped him and he ran away (no warrants or anything). The family thought it was rather funny since the police were right there with his car, with his license tag on it. They know who he is when they have that info. Some people have an inordinate fear of police. I think now, wow, they could have shot him in the back for running away. Weird.
If you read their posts, there are some here advocating the police do exactly that.