Black Book

"Black Book" is the nickname frequently used to refer to a list of people who are unwelcome in casinos. The name comes from the fact that the people listed are essentially blacklisted. The term can refer either to such a list officially maintained by a particular gaming control board or to the Griffin Book, whose information is shared among subscribing casinos. According to technologist Jeff Jonas, "Casinos face legal and financial risk if they let the wrong people play. People with gambling addictions can place themselves on exclusionary lists, and can actually sue casinos if they are allowed to place bets."