Part III: Slot Machine Cheating · Physical Cheating Methods · #5.32
Fraudulent Voucher Printing (Jumper Wire Method)
How it works
An inside job that began in September 2006 and became public in late 2007. Slot workers used test machines in a back room, with software that let them mimic machines on the slot floor that had been turned off. Slot workers allegedly printed tickets of a few hundred dollars each, to escape notice, and two accomplices posing as customers cashed them. The tickets were technically valid in the system because they came from a legitimate machine number connected to the network. The estimated loss exceeded $1 million.
Where it appears
Casinos with networked TITO systems and slot tech shops.
On the record
Nevada’s slot Minimum Internal Control Standards now require quarterly procedures to check the voucher system’s integrity, for example that vouchers are created only by active slot machines on the casino floor.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches fraudulent voucher printing (jumper wire method), and what stops it recurring, written for the desk, not the reader.
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Sources
- Nevada Gaming Control Board - Slots FAQs (fraudulent vouchers from out-of-service machine)Regulator document
Sources last checked 2026-08-14
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.