The article explores "The Bull Pen," a unique casino once operated within the Nevada State Prison in Carson City. Open from 1932 to 1967, it was the only legal prison casino in the United States. Inmates could gamble on games like blackjack, craps, and poker, providing a surprising outlet for entertainment and socialization. This unusual institution highlighted a progressive yet controversial approach to prison life. Its legacy remains a fascinating chapter in both prison and gambling history.