It is illegal for anybody to bring certain forms of contraband into a jail or prison in Oklahoma.
57 O.S. §21 Provides that persons bringing guns, knives, bombs, or any dangerous instrument, any controlled dangerous substance, any intoxicating beverage or low-point beer, money or financial instruments for anyone other than the inmate or their spouse (including tax returns!) is guilty of a felony and subject to a penalty of from 1 to 5 years in prison.
It provides that an inmate in possession of the above items is subject to a term of 5 to 20 years in prison and that inmates with two or more prior felony convictions are subject to a term of 10 to 20 years in state prison.