An EMP slot machine jamming device. (CBP) The ElectroMagnetic Pulse (EMP) devices, which are prohibited by the Federal Communication Commission, are used to "jam" the inner workings of a slot machine.

Monkey paw. Kickstand. Yo-yo. These are some of the cheating devices criminals brought to Nevada casinos to trick slot machines into producing unwarranted payouts. And those who used them were often ...