it's always been going on.
only now, we have more video evidence thanks to cell phones, and more national awareness because it's a hot story right now.
One can only imagine how many "heroic" cop shootings in past decades were just cops executing people.
I gotta say - anytime a cop kills a person and there are no witnesses - at the VERY least, the cop should take a lie detctor test. Don't prosecute if he fails, but reconsider ever putting him back on the street with a gun, ya know? Police have some of the most powerful jobs in the country, with the least accountability. They're just like everyone else - except 1/3 of the population blindly supports them no matter what, regardless of facts of situation.