Probably more than a thousand citizen have been shot dead by a cop in America in 2013. Exact numbers can not be given because police refuses to cooperate on building data bases. Even with the FBI.
In England exactly zero citizens have been killed by a police officer in that same year. 'Yeah, but that's because police and citizens don't carry guns!'
-'So you're saying that when people don't carry guns, nobody gets shot? So in order to have less shootings we should ban guns, right?'
'Well...er...that's not what I meant.'
It's amazing how few American cops know the law. They obviously don't learn about the law in their training. Luckily there are some citizens out there who are willing to take the time and effort to teach cops how the law works: