It's Illegal To Count Cards In Canada!
Is It Really Illegal To Count Cards? What the law says in Canada and the United States, and how casinos handle players who use this strategy.
Here's The Truth About Canadian Casinos
According to a Canadian law firm specializing in criminal defense the Ontario Court of Justice has answered the question “is it illegal to count cards” and ruled it’s not a criminal offense. This principle was reinforced in the 1995 case R v Zalis, where several players were accused of cheating while playing blackjack at Casino Windsor.
They were charged under Section 209 of the Criminal Code, which targets anyone who “cheats with the intent to defraud.” The Supreme Court of Canada clarified in R v McGarey that cheating must involve an unlawful device or manipulation that alters the nature of the game. Simply using skill and observation does not meet that standard.
In the Zalis case, the accused used card counting techniques, concealed their identities, and operated as a professional team. Still, the court ruled they did not cheat. Their advantage came from skill, not from tampering or deception that changed how the game was played.
While the court found no criminal wrongdoing, casinos retain the right to refuse service. They can eject or ban anyone suspected of counting cards, since private gaming establishments can set their own participation rules. In practice, this means counting cards won’t get you arrested—but it can get you shown the door.
Is It Illegal To Count Cards in the U.S.?
Most states in the US define cheating as any action that alters the outcome of the game or manipulates the cards, bets, or dealer’s actions. Counting cards does none of that.
Card counters use only their brains within the casino’s own rules. The casino deals the cards; the player simply observes patterns and bets strategically. That’s not fraud—it’s intelligence. Casinos may dislike it, but they can’t call it illegal.
That said, casinos in the US, just like in Canada, can still ban or “back off” players they suspect of counting. It’s a civil, not criminal, issue. They control access to their games, and advantage players accept that risk as part of the trade-off.
Our Student Experiences Counting Cards Across Canada
Canadian casinos are generally polite when dealing with card counters. In most cases, I’m told I’m welcome to play roulette, slots, or other table games—just not blackjack. Other times, the message is more subtle: the pit boss whispers to the dealer, and suddenly, the next shoe is cut in half. No words needed. We both know what’s happening.
Casinos understand that card counting isn’t illegal, but they also protect their bottom line. It’s a quiet balance between respecting the law and managing their risk. As long as you know the difference between illegal and unwelcome, you can decide whether the risk of a back-off is worth the reward.
Casinos Losing Profits?
Legally, card counting sits in a gray area that leans entirely in the player’s favor—it’s not illegal in either Canada or the U.S. The real issue is casino policy. While casinos have every right to refuse service, their approach often works against them. By backing off or banning every suspected counter, they end up turning away players who pose little to no actual threat.
The reality is that most people who try to count cards can’t do it effectively. The skill requires intense focus, near-perfect accuracy, and emotional control—traits very few players consistently maintain. In practice, 9 out of 10 self-proclaimed card counters lose money over time.
Casinos could protect their profits more efficiently by learning to identify the rare, truly skilled advantage players, rather than blanket-banning anyone who changes their bet size. Their current strategy might prevent a handful of professional counters from gaining an edge, but it also alienates many recreational players who pose no real risk.
In short, casinos aren’t just protecting themselves—they’re also leaving money on the table.