Murphy said the officer who used the Taser - described as Officer #3 in the report also coarsely threatened to use the Taser in the man's anus and genitals. Murphy's report says that use of Taser on a man's buttock's does not violate policy in and of itself; the question is whether it was "reasonable and necessary."
My favorite quote from the land of the free in this case:
Officer #3: Okay, I’m gonna take this Taser out of your asshole now. Are you going to fight with me?
Complainant: No, not at all, sir.
The officer who did this is still on the force. Tasing someone's genitals is within the procedures allowed if "reasonable and necessary."