MISSOULA, Mont. — A Montana State Prison inmate, a former inmate and a former prison laundry worker have been arraigned on federal drug distribution charges that prosecutors say came to light during an investigation into drug smuggling at the prison in Deer Lodge.

The U.S. Attorney’s Office says 28-year-old inmate Ian Scott Barclay, 28-year-old probationer Cordero Robert Metzker of Billings and 48-year-old Erin Marie Bernhardt of Deer Lodge pleaded not guilty Tuesday to conspiracy to possess drugs with intent to distribute, and possession of methamphetamine and Suboxone with intent to distribute. Barclay is charged with bribing Bernhardt and she is charged with accepting bribes.

A guard, Martin Reap, was arraigned on May 19 on charges he smuggled meth and marijuana into the prison. It’s not clear if the cases are connected. The indictment naming Barclay, Metzker and Bernhardt remains sealed.