Minimum - Minimum security prison consists of dormitories that are not very secured, and are monitored by correctional officers regularly. As they used to hold people who committed a crime that wasn't as violent such as driving drunk or other crimes of such nature, there are no watch towers surrounding minimum security prisons, and they usually have a single fence perimeter. The movement of inmates isn't controlled, and they’re free to move within the prison without any problem. The inmates in minimum security prisoners are usually asked to do community based work such as road maintenance or working for a civilian employee etc.
Medium – Medium security prisons are not as secured, but securer than minimum security prisons. They usually consist of dormitories that are capable of holding around forty-nine to fifty inmates. Unlike minimum security prisons, inmates are not allowed to move as freely, and are supervised almost all of the time. At night each dormitory is locked, and supervised by a correctional officer who monitors every movement. Medium security prisons are also covered by double fenced perimeters, and usually have watch towers, so that no one escapes.