A former federal prison guard pleaded guilty Monday to bribery charges, admitting he took money to smuggle tobacco into the Leavenworth Penitentiary.

Marc Buckner, 47, Kansas City, Kan., pleaded guilty to one count of a public official accepting bribes. In his plea, he admitted he was paid each time he smuggled tobacco into the prison. He hid tobacco and rolling papers in two handmade insoles in his shoes.

Inmates paid Buckner $750 for each can of Bugler brand tobacco and rolling papers he smuggled. He said he smuggled tobacco once or twice a month for years.

Sentencing will be set for a later date. Acting U.S. Attorney Tom Beall said Buckner faces a penalty of up to 15 years in federal prison.