Along with other soldiers of his Army Reserve unit, the 372nd Military Police Company, Frederick was accused of allowing and inflicting sexual, physical, and psychological abuse on Iraqi detainees in Abu Ghraib prison, a notorious prison in Baghdad during the United States' occupation of Iraq.

In May 2004, Frederick pleaded guilty to conspiracy, dereliction of duty, maltreatment of detainees, assault, and indecent acts.

He was sentenced to 8 years' confinement and loss of rank and pay, and he received a dishonorable discharge.

Frederick was a staff sergeant and the senior enlisted soldier at the prison from October to December 2003.

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