Field guide
EMP Jammer / Magnetic Interference
How it works
A device that emits an electromagnetic pulse to disrupt a slot machine’s internal electronics, potentially causing malfunction, credit miscounting, or jackpot triggering. Cheaters conceal a high-voltage coil or spark gap device near the machine. Customs said an electromagnetic pulse disrupts electronics from about a meter away. A Wisconsin charging report said devices of that kind were alleged to create credits. In a 1985 federal case, a witness testified he used strong magnets to confuse circuitry and wires to line up reels. Those accounts do not say the pulse caused random-number-generator errors.
On the record
U.S. Customs has seized a device it called an electromagnetic-pulse slot-machine jammer. Police in Italy have reported an EMP jammer aimed at slot machines and people in the United States have been charged with using such devices to create credits on machines in bars. Sales on criminal forums and use in Asian casinos, were not found in the sources checked.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches emp jammer / magnetic interference, 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.