That's a reasonable assumption considering the cops knew they were being filmed when holding people at gunpoint on the ground in handcuffs. I can only imagine what they did when the cameras weren't rolling..
Of course it's only a guess, but I'd say it's highly probable.
Being held at gunpoint and handcuffed until they determine who I am and what's in my vehicle is reasonable behavior for the police. It's fine with me.
I suppose you wouldn't mind if their finger "slipped"?