D-Tox (2002)

A disgraced FBI agent with a drinking problem joins nine other troubled law enforcement officers at an isolated detox clinic in the wilds of Wyoming. But the therapeutic sanctuary becomes a nightmarish hellhole when a major snowstorm cuts off the clinic from the outside world and enables a killer on the inside to get busy.

Directed by: Jim Gillespie
Produced by: Ric Kidney, Kevin King
Genre: Crime | Horror | Mystery | Thriller
Starring: Sylvester Stallone, Tom Berenger, Charles S. Dutton, Sean Patrick Flanery, Christopher Fulford

Plot: Stallone plays a cop who comes undone after witnessing a brutal scene on the job. He checks into a rehab clinic that specializes in treating law enforcement officials. Soon, he finds that his fellow patients are being murdered one by one.

http://www.imdb.com/title/tt0160184/
http://en.wikipedia.org/wiki/D-Tox