<P> A range of card counting devices are available but are deemed to be illegal in most U.S. casinos . In February 2009, the Nevada Gaming Control Board issued a warning that an iPhone card counting application was illegal in that state . Card counting with the mind is legal and usually more accurate than this application . </P> <Table> <Tr> <Td> </Td> <Td> The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject . You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate . (December 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject . You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate . (December 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> Card counting is not illegal under British law, nor is it under federal, state, or local laws in the United States provided that no external card counting device or person assists the player in counting cards . Still, casinos object to the practice, and try to prevent it, banning players believed to be counters . In their pursuit to identify card counters, casinos sometimes misidentify and ban players suspected of counting cards even if they do not . </P>

What is card counting and why is it illegal