<P> Monitoring player behavior to assist with detecting the card counters falls into the hands of the on - floor casino personnel ("pit bosses") and casino - surveillance personnel, who may use video surveillance ("the eye in the sky") as well as computer analysis, to try to spot playing behavior indicative of card counting . Early counter-strategies featured the dealers' learning to count the cards themselves to recognize the patterns in the players . Many casino chains keep databases of players that they consider undesirable . Casinos can also subscribe to databases of advantage players offered by agencies like Griffin Investigations, Biometrica and OSN (Oregon Surveillance Network). Griffin Investigations filed for Chapter 11 bankruptcy protection in 2005 after losing a libel lawsuit filed by professional gamblers . In 2008 all Chapter 11 payments were said to be up to date and all requirements met, and information was being supplied using data encryption and secure servers . If a player is found to be in such a database, he will almost certainly be stopped from play and asked to leave regardless of his table play . For successful card counters, therefore, skill at "cover" behavior, to hide counting and avoid "drawing heat" and possibly being barred, may be just as important as playing skill . </P> <P> Detection of card counters will be confirmed after a player is first suspected of counting cards; when seeking card counters, casino employees, whatever their position, could be alerted by many things that are most common when related to card counting but not common for other players . These include: </P> <Ul> <Li> Large buy - ins </Li> <Li> Dramatic bet variation especially with larger bets being placed only at the end of a shoe </Li> <Li> Playing only a small number of hands during a shoe </Li> <Li> Refusal to play rated </Li> <Li> Table hopping </Li> <Li> Playing multiple hands </Li> <Li> Lifetime win </Li> <Li> Racial profiling (in some non-U.S. locations) </Li> </Ul> <Li> Large buy - ins </Li>

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