Not at all. All the cop has to do is say the cop magic phrase "He made a threatening gesture" and he's home free. It then becomes a "good shoot" and the official police whitewash truck will come and cover everything up. Dead men (or teens) tell no conflicting stories.
I didn’t mean I thought the cop would fry, I just meant it looked like he is guilty as hell of murder. Sadly there is a distinction between the two in this day and age.