Is it illegal to count cards in a casino?

Totally Legal

It is legal across the US, but casinos are private property and can ban you.

Card counting is not a crime under federal or state law as long as you are using only your natural mental faculties. Using an external device, a hidden computer, or a team of scouts to signal information may cross the line into illegal cheating. While you cannot be arrested for simple mental counting, casinos are private establishments with the legal right to refuse service to anyone. If you are caught, you will likely be 'backed off' and asked to leave, which can lead to trespassing charges if you return.

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JURISDICTION

In Atlantic City, New Jersey, a Supreme Court ruling prevents casinos from banning card counters solely for winning, though they may still limit their gameplay.

FUN FACT

The legendary MIT Blackjack Team used a legal loophole and complex mathematics to win millions from casinos throughout the 1980s and 1990s.

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