Control is a 2004 American direct-to-video film directed by Tim Hunter and starring Ray Liotta, Willem Dafoe and Michelle Rodriguez.
A neuropharmacologist, Dr. Copeland, tells him that he has a choice: either agree to be a human subject for an experimental drug trial with potentially serious or fatal side effects, or he will receive a truly lethal injection.
Oliver opts for the drug trial, where he is administered a "calming" medicine on a daily basis and tested extensively to see if his sociopathic tendencies decrease.
Twice, Oliver fakes being relaxed to lull the guards and scientists into a false sense of ease, whereupon he attempts an escape.
Over time, the medicine and psychological counseling do appear to lower his sociopathology, as measured physiologically and emotionally, and Oliver undergoes "phase two" of the procedure, where he is reintroduced into society, with a false identity and a changed appearance (tattoos and scars removed, dress and hairstyle change).