well yeah, more evidence came to light....without evidence we likely woudn't get much done...it's necessary.Only because of the video getting released and the problem of the police investigating themselves still exists.
There is always going to be a problem, of the Govt watching itself...always....that's why we have set up different levels, like in this case, the State overtook, and looked at the local level, and so on and so further...is it going to be perfect? No....but to date it's the best in the world.