Field guide
String-Attached Coin (Yo-Yo)
How it works
An evolution of the classic coin-on-a-string cheat using modern materials to defeat improved coin slot sensors. A former Nevada enforcement chief described string taped to a coin and a version with a hole drilled in the coin so the string could be tied. Manufacturers added rotating blades that a coin had to pass through before a credit registered. The same account does not say a string coin still beats those blades.
On the record
Yo-yo users were often candidates for Nevada’s List of Excluded Persons and Douglas William Barr Sr. was listed for using coins with strings. Coinless machines later closed off that coin chute.
Detection & preventionADVISORY
The paid halfHow a monitoring room catches string-attached coin (yo-yo), 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.