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As I understand, in Las Vegas, as long as you do not use a device to aid with card counting (mind/mental only), it is legal. Is that still true?

Sure, it's "legal"—but so is them banning you from playing blackjack or tresspassing you from their property.

Great point. Thank you to clarify. Casinos in Las Vegas are private. They have the right to ask anyone to leave for any reason.

In New Jersey they can’t kick you out for card counting.