Infirmary

"And after you took the activated charcoal, your head cleared, but the compulsion remained. My guess is that there was a drug along with the compulsion, so that you would be confused enough not to question why you were doing something you wouldn't ordinarily do." Charity says. "Now I'm wondering what the person is going to do when they realize that their plan didn't work."

Or hasn't worked yet, anyway. Leaving Calvin locked up to keep him from killing his uncle isn't really a viable long-term solution.