Card Counting in US Casinos: Totally Legal (But They'll Still Throw You Out)
The Short Answer
Despite widespread belief, card counting is not illegal under any federal or state law in the United States. Casinos can — and do — ban counters from their private premises, but no law criminalizes the mental skill itself.
The Full Story
The myth that card counting is illegal is one of gambling's most enduring misconceptions — and Hollywood deserves much of the blame. Films like '21' (2008) dramatize casino security hunting down card counters as though they were criminals, when the reality is far more mundane: a polite (or not-so-polite) escort to the exit.
The modern card counting era began in 1962 when mathematician Edward O. Thorp published 'Beat the Dealer,' proving blackjack could be beaten with a systematic mental tracking method. Casinos panicked and lobbied for legal protections, but legislators never actually criminalized the skill itself — they only outlawed mechanical aids.
The most significant legal test came in 1982's Uston v. Resorts International Hotel, Inc. (89 N.J. 163), where the New Jersey Supreme Court unanimously ruled that Atlantic City casinos could NOT ban skilled card counters, since the Casino Control Commission — not individual casinos — had exclusive authority over game rules. New Jersey remains the only US jurisdiction where casinos cannot legally expel a player simply for being too good at blackjack, though they may use countermeasures like frequent shuffling or bet limits.
In Nevada, casinos are private businesses and may refuse service to anyone for any non-discriminatory reason. Being good at math is not a protected class. A counter who refuses to leave after being asked faces misdemeanor trespassing charges under NRS 207.200 — but that's for trespass, not card counting itself. In March 2000, the Nevada Supreme Court even ordered the Monte Carlo Casino to pay card counter Richard Chen the $40,400 he won at blackjack, reinforcing that winnings from legal skilled play belong to the player.
The device prohibition (NRS 465.075), enacted in 1985, is the one genuine law in the mix — and it's serious. Using a phone app or concealed computer to count cards at a Nevada casino is a Category B felony carrying 1–6 years in prison and up to $10,000 in fines.
Common Misconceptions
- 'Card counting is illegal' — FALSE. No US law criminalizes mental card counting. 2. 'You'll be arrested if caught' — FALSE. You'll be asked to leave; only if you refuse (trespass) or return after a ban can you face criminal charges. 3. 'Casinos can keep your winnings if you're caught counting' — GENERALLY FALSE. Winnings from legal skilled play belong to the player; the Nevada Supreme Court confirmed this in Chen v. Monte Carlo (2000). 4. 'Using a counting app is the same as counting in your head' — FALSE AND IMPORTANT. Using any electronic device is a felony under NRS 465.075. 5. New Jersey is sometimes overlooked: Atlantic City casinos legally CANNOT ban card counters at all, per the 1982 Uston ruling.
Actual Legal Text
No federal statute and no US state statute criminalizes the mental act of card counting. Nevada's cheating statute (NRS 465.083) defines cheating as altering the elements of chance or the outcome of a game — card counting does neither. What IS illegal under Nevada Revised Statute 465.075 is using any electronic, mechanical, or computerized device to assist in tracking cards or calculating probabilities at a licensed gaming establishment. Using your brain: legal. Using an app or concealed computer: a Category B felony.
Current Status
Never Enforced
Penalty
No penalty exists for mental card counting — it is not illegal. If caught using an electronic device to count cards in Nevada: Category B felony, 1–6 years prison and/or up to $10,000 fine (NRS 465.075). If asked to leave and refusing: misdemeanor trespass, up to 6 months jail and/or $1,000 fine (NRS 207.200).
Last Verified
July 21, 2026
Jurisdiction Notes
Applies nationally — no US federal or state law criminalizes mental card counting. Key state-level nuances: Nevada (NRS 465.075 bans devices, casinos may eject counters); New Jersey (Uston ruling prohibits Atlantic City casinos from banning counters). Tribal/sovereign nation casinos operate under their own authority.