Most inmates are trying to get out of prison, but authorities say they caught a California parolee trying to sneak back in.
Corrections Sergeant Tony Quinn said 48-year-old Marvin Lane Ussery was spotted scaling the seven-foot tall, barbed wire-topped fence that encircles a large wooded area behind the California State Prison in Sacramento.
Sgt Quinn said Ussery served time at New Folsom for robbery before he was paroled in June 2009.
Officials are investigating whether Ussery was attempting to smuggle in drugs or mobile phones, but say they have not found any contraband.
Ussery is being held in Sacramento County Jail on suspicion of violating his parole and being an ex-convict on prison property.