To ensure a safe environment, TCs generally require abstinence from alcohol and other psychoactive drugs (unless authorised). Programs generally have cardinal rules (e.g. no drug use, no violence, no stealing, no sexual relations with other residents) which, if violated, can lead to termination from the program. There are clear procedures for responding to breaches of community values, with differing levels of response to reflect
the specific circumstances. Contact outside the TC is
monitored or supervised, and restricted, particularly in the early stages of treatment. Most programs include regular drug screening, including where there are grounds for suspecting possible drug use.