Large jars of peanut butter have been banned in Tennessee’s 15 state prisons because inmates were hiding guns, drugs and other contraband in the 18-ounce containers, state corrections officials said.

The ban came after an investigation revealed that George Hyatte, a prisoner in Knoxville, had concealed a smuggled cell phone in a jar of peanut butter at the prison where he was being held and used it to coordinate a deadly breakout while being taken to court in August.

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