What he did was criminal.
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OK. What crime, specifically, is this cop guilty of? You said he did something criminal. What was it?
Rape. For starters.
I'm not certain what all he's qualified for. If she was selling her services when he picked her up (and it sounds like she was), he used his position as an officer of the law not only to (1) get her into his car, but also to (2) steal what she was selling.
So, I guess what he did is called extortion, kidnapping, robbery, etc. But, it's not rape.