What Is A Prison Commissary?
One of the main reasons a prison commissary exists is to control contraband from entering a prison. Visitors and lawyers may also try to provide inmates with illegal goods or forbidden items that may be fashioned into weapons or used for illicit purposes (i.e. a battery-operated device may be fashioned into a tattoo-gun). Likewise, prisons make sure that prisoners use their purchases as intendedincluding fashioning it into another purpose or are using it to run a market of their own.
As many inmates also work in prison, they need a place to spend their hard-earned money. This helps create an incentive for workers, especially ones who have a distant release date.