No. Counting cards in blackjack is when a player mentally keeps track of the cards that are dealt. Legally, that is not cheating and therefore not illegal. However, casino officials of a licensed gaming establishment who suspect players of counting cards are within their rights to ban  (blacklist) those players from gambling in that casino or even entering the premises. And these banned players face trespass (NRS 207.200) charges if they refuse to leave or re-enter the premises later on.