The Addicted.

25 years after a patient in a drug rehab clinic commits suicide, 4 friends decide to spend a night in the abandoned clinic to try and film some of the reported paranormal goings-on. Shortly thereafter, an up and coming TV journalist is persuaded to spend a night in the clinic with 3 of her friends to try and film some of the spooky activity. In the course of one night, they discover the sickening truth about the history of the clinic and have to face the possibility that they might never leave.