Its not dealer looking for this. It is the Pit Bosses watching over their group of dealers and tables and then the other observers watching the Pit Bosses and their tables.
Pit Boss or above them will note someone winning a lot or giving off tells that they are doing some kind of memorization or tracking of cards. Its not against the law but as a Casino is no different than any private business, they can refuse service to anyone if they feel you are costing them money or are a problem.
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