Part III: Slot Machine Cheating · Electronic & Digital Cheating Methods

SCAM #29: Light Wand / Optical Sensor Blind Attack

How it works

Tommy Glenn Carmichael invented the “light wand” after slot machine manufacturers added optical sensors to track coin payouts from hoppers. The device consists of a miniature light bulb (from a camera) connected to a small battery pack, all concealed to fit up the payout chute. When inserted into the machine and activated, the intense light blinds the optical sensor that counts coins being dispensed. The machine continues to pay out coins but “sees” nothing, allowing the cheater to empty the entire hopper. The device is small enough to be concealed in a hand and used in seconds. Carmichael also developed the “monkey paw” — a flexible metal rod with piano wire that could trip the microswitch controlling the hopper directly. These devices represent the transition from purely mechanical cheating to exploiting electronic sensor systems.

Where it appears

Slot machines with optical coin counting sensors — primarily IGT and other manufacturers’ machines from the early 1990s through early 2000s

On the record

Tommy Glenn Carmichael operated from 1980-2001, stealing an estimated $5-10 million. He invented the monkey paw in 1990 and the light wand in 1992 after visiting an IGT showroom disguised as a customer and learning about the new optical sensors. Carmichael was caught by an FBI sting operation in 2001, served 326 days in prison, and was banned from all casinos. He later worked as a consultant to the gaming industry, helping identify cheating vulnerabilities. He died in 2019.

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.