Before receiving a gambling license, an applicant must undergo a thorough investigation by the Nevada Gaming Control Board. People are routinely rejected if they have a criminal history or have associated with unsavory characters.So then, how did inmates at the Nevada State Prison - every one of them a convicted criminal - operate their own casino for 35 years?Blackjack, craps, poker, gin rummy, even sports betting were available as recreational activities for inmates at the state's maximum security prisons between 1932 and 1967.Inmates operated the "Bullpen," a stone building converted into a casino, on the grounds of the state prison …