The possession by an inmate on his person or in his cell, immediate sleeping area, locker, or immediate place of work or assignment of any form of securities, bonds, coins, currency, or legal tender, unless expressly and specifically authorized by the individual institution concerned, shall constitute contraband and be subject to forfeiture. With respect to state correctional institutions, all such securities, bonds, coins, currency, or legal tender shall vest in the state and shall be paid into the state treasury. With respect to county correctional institutions, all such currency and other items shall vest in the county and shall be paid into the county treasury.