18 U.S. Code § 242 - Deprivation of rights under color of law, and
18 U.S. Code § 241 - Conspiracy against rights
Yes, I know, he's state and doesn't have federal jurisdiction, but how much you want to bet he knows federal prosecutors and/or grand juries?
(Grand juries should really exercise their powers of presentment more often, especially against government officials.)
I am a big fan of the last 6 words of 18 USC 242.