Chics can lie, cops can be unethical, and the court will pick up charges/go to trial on an issue just because they make $$ doing so.
Well it's more than just he said she said:
The victim told police Foster dragged her by her hair, physically threw her out of the house and punched her in the head eight to 10 times. She was treated at a hospital for multiple injuries, including a ruptured eardrum, prosecutors said.