Part II: Table Game Cheating · Roulette Cheating Methods · #3.7
The Magnetic Roulette Ball (Remote-Controlled Ball)
How it works
This sophisticated cheat involves replacing the casino’s standard roulette ball with a ball containing a magnetic core (often steel or ferromagnetic material). A confederate, either a dishonest dealer who introduces the ball into play or a player who switches balls during a distraction, places the magnetic ball on the wheel. An accomplice concealed nearby operates a hidden electromagnet or radio-frequency device that can influence the ball’s trajectory as it slows. In one documented variation, a team used hidden under baggy pants to pull the ball toward a target sector. The magnet’s polarity could be reversed or pulsed to either attract or repel the ball at critical moments. Popular accounts of the 1973 Deauville case claim about 90% accuracy in sending the ball to a six-number section.
Where it appears
All roulette variants; requires inside access to introduce the ball
On the record
The Monique Laurent Case (1973): Monique Laurent, her husband, and her brother (a croupier with radio technology expertise) used a modified roulette ball with a radio receiver inside. Monique operated a transmitter disguised as a cigarette pack from the audience. Her husband bet on a specific six-number range. The system achieved ~90% accuracy, earning them roughly 5 million French francs in one week before the casino owner grew suspicious of the sister's small, losing bets at the same table and had the equipment found by a debugging crew, according to popular accounts. Popular accounts link the case to the 1984 French film Tricheurs. The Austrian Casino Case (2003): a fraudster reportedly swapped the roulette ball at Casino Velden, part of Casinos Austria, for a magnetic ball.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches the magnetic roulette ball (remote-controlled ball), and what stops it recurring, written for the desk, not the reader.
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Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction: the method is described so it can be recognised.