ANIMALS - Rats, like humans, return to drinking once punishment is removed

Once heavy drinking impairs function, a variety of punishment-related threats may motivate people to stop drinking: spouses may threaten divorce, employers may threaten job loss, and courts threaten drunk drivers with losing their driver's license or incarceration. In the face of these threats, many alcohol abusers refrain from drinking, but relapse is very common when the threats of punishment fade, particularly when exposed to alcohol-associated environments (contexts).

http://medicalxpress.com/news/2013-01-rats-humans.htm