In Portland OR over the weekend, I witnessed this first hand. It wasn't even random people, it was press, with press badges. Beaten with a riot stick, and maced, multiple times. After he was beaten and maced he started limping away, the officer raised the mace, then hit him in the back a couple of times till the reporter turned around, then maced him full in the face. You can see the first hand and CCTV footage on Cory Elia's Twitter account, @TheRealCoryElia. He's also a news journalism professor at Portland Public University I believe.