Not just American cops.
They did this to my boy infront of me.
Stopped my car and he was in the back, asking him his name and shit, he said you didn't stop me.
Police cuffed him whilst in the back dragged him out by the cuffs, had him standing then suddenly decide to sweep his legs put him face down on the ground.
In the melee female officer said he kicked her, when they put him on the ground another female officer came and was stamping on his legs while a male officer had his knee in his back.
Called about 10 more officers, going through my boot etc... Then threw my boy in the van spent the night in cell and cautioned him for kicking the police woman (was bullshit).
That's the brief version, 1 of the most traumatic nights of my life, just 4 guys of colour going to get something to eat.