Due to the fact that real money is prohibited in prison and many facilities have become "nonsmoking", stamps and non-perishable foods have become the new standard form of currency in many prisons.
Step-by-step explanation:
Prisoners are not permitted to own money. If they can gain money by serving a job in prison or their family grants them money, it accords into their prisoner trust fund. Most prisoners describe this as their “commissary money.”
Many prisons throughout the country have embraced nonsmoking policies, which has mainly drawn about an end to the practice of cigarettes as prison currency. Today nonperishable food items like tuna fish and dried noodles, and postage stamps have risen as an approved form of currency