Although I agree that the actions of the prolice were out of wrong, she WAS drunk in public... So there WAS a reason for arresting her.
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Drunk in public has multiple connotations.
From the video she looked both in control of herself and lucid so I don't think she was drunk in public.
People don't need to be treated that way unless they are violently refusing to cooperate or endangering the public.
Neither was happening in the video when the female officer applied force to the woman.
They had a good look through her pockets and frisked her so there was no excuse to cut her shirt or bra.
These cops went way over the line in this and the same thing happened at G20 in Toronto. There is a new mentality that it's OK to use overwhelming force at the first sign of confrontation. We aren't going to have that thuggish brute squad attitude systemic in the security forces in this country for any reason. If those serving in that position of authority feel it's right to use force like that on someone as obviously in control as that woman in custody in the video was, they need to get out of that position because they are neither wanted nor needed for that job.
If you can't manage prisoners better than that, then bugger off into some career that keeps you away from the public.