Drew Peterson in court today for gun charges

Former Bolingbrook police officer Drew Peterson is slated to appear in court later in the day, and a Will County judge could decide whether to throw out the gun charges against him.

A grand jury indicted Peterson on two felonies related to a semiautomatic rifle seized by authorities investigating the disappearance of his wife, Stacy. Authorities contend Peterson possessed an assault rifle with a barrel shorter than allowed by law.

Defense attorney Joel Brodsky argues that his client is immune from prosecution for the gun charges because he was still a police officer when authorities seized the weapon.

Peterson has been named a suspect in his wife's disappearance but hasn't been charged.

Investigators have also exhumed the body of Peterson's third wife, Kathleen, and ruled her death a homicide.