What's nonsense? A cop getting away with sexual assault? Yes, I agree, that's utter nonsense, and needs to be corrected.
Even if you rebuke every advance she makes, tell her to stop groping you, and are assertive in telling her that what she's doing is not okay, she still comes after you.
Later on you are smoking with your sis and she catches you, telling you that the only way to get out of being in trouble is to agree to clean her place. So you can choose not to "play" any part of her path, but you will still have interactions with her.
That's why I'm hoping that when you do you can do something about getting her dangerous ass off the streets.