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> It is not against the rules to gather data--in fact many casinos encourage it

Except when it's blackjack and you're counting cards.

you are allowed to count cards at most (all?) casinos in the usa.

It's legal, but if you're too successful, a lot of casinos will show you the door, sometimes preventing you from converting your chips back to money. See https://youtu.be/rjfLuM-Pqr8

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