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

SCAM #8: EMP Slot Machine Jamming

How it works

Handheld Electromagnetic Pulse (EMP) jamming devices emit high-frequency electromagnetic waves capable of disrupting a slot machine’s internal circuitry. These devices can interfere with pulse-based communication systems used by bill acceptors, coin mechanisms, and credit systems. The EMP pulse mimics the high/low voltage transitions that these systems use to register events, tricking the machine into thinking legitimate credits have been inserted. Modern EMP jammers can be concealed in phones, cigarette packs, or other everyday items. The attacker activates the device near the machine, causing it to malfunction or register phantom credits. Some devices are powerful enough to disrupt the machine’s CPU, causing it to enter an error state that may result in unintended payouts or reset to default configurations with different payout percentages.

Where it appears

Slot machines with pulse-based peripheral systems (bill acceptors, coin acceptors, ticket printers) that have not been upgraded to serial communication protocols

On the record

In February 2022, U.S. Customs and Border Protection seized an EMP slot machine jamming device kit at the Port of Milwaukee arriving from Hong Kong, destined for a residence in Mosinee, Wisconsin. The shipment was manifested as a “car adapter.” The FBI Mechanical Engineering Division confirmed the device’s purpose. These devices are prohibited by the Federal Communications Commission (FCC). EMP jammers have been documented in casinos across the United States, Europe, and Asia.

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.