A book of suspected card counters and casino “cheaters” provided to casinos by Griffin Investigations. These guys went out of business because they were so poorly run and thought about the game with less simplicity than a caveman thinks about a rock.

In the Griffin Book, published by Griffin Investigations, listed individuals are generally suspected of being, or known to be, either advantage players or outright cheaters at the casino games themselves. Thus, casinos find it in their own economic best interest to exclude such individuals. Those listed may be anyone perceived as a threat to the casino's profits, whether through legal means, such as card counters, or through illegal means, such as people who mark cards or those who try to cheat slot machines. Included also are those considered a threat to the casino, such as players the casinos simply believe are winning either too much or too often, even if their exact methodology is unknown. The book keeps pictures obtained either from a photo of the individual when detained or simply questioned and released, or from surveillance photos. At least one successful defamation lawsuit has been brought as a result of the Griffin Book.