A former guard at the federal pen in Pollock could face 20 years in prison. 26-year-old Brandon Willis pleaded guilty Thursday to attempted introduction of contraband into a prison. Investigators say Willis sold tobacco, cell phones, and drugs to convicts, then threatened to hurt the convicts if they ratted on him. They say he also attempted to introduce heroin and methamphetamines into the prison. On top of a maximum 20 years in prison, he could be slapped with a $250,000 fine.