Since the very first casino opened its doors, an endless war has raged between the operators trying to protect their money and the criminals trying to steal it.

Cheating is no longer about complex card counting (which is technically legal); it is about physically manipulating the cards, the dice, or the chips after the outcome is known.
How Cheaters Manipulate Casino Chips
The most common and arguably the most difficult-to-detect method of table game cheating is a sleight-of-hand maneuver known universally as "past posting."

While the dealer's eyes are momentarily distracted by the sudden commotion, the extra high-denomination chips are seamlessly slid onto the winning betting circle.
The scam almost always involves a loud, intentional distraction created by an accompliceCheaters also use "pinching," which is removing chips from a bet after losing the handIf a player is constantly hovering their hands near their chips after the deal, pit bosses become highly suspicious The Complex Scam of Edge Sorting
Historically, this involved utilizing invisible ink readable only with special contact lenses, or using a fingernail to create a tiny, microscopic dent in the cardboard.

Edge sorting relies on finding tiny, microscopic manufacturing defects in the geometric patterns printed on the absolute back edge of the casino's playing cards.
The Mechanics of a Craps Scam
The craps table is extremely difficult to cheat due to the massive size of the table, the required wall-bounce, and the presence of four highly trained dealers.

By keeping the desired number facing upward during the entire slide, they only have to worry about the random outcome of the second tumbling die.
Scam NameRequired Skill LevelDetection DifficultyDice SlidingExtremely High (Physical skill)Low (Dealers watch the throw closely)Invisible InkLow (Requires tainted deck)High (Requires UV light to detect)
Attempting to cheat a modern casino is an incredibly foolish endeavor that almost universally ends in severe felony charges and prison time.