Robert Ritchie was sentenced to two days of house arrest and two years' probation.
The Columbian reported that Ritchie punched a mentally ill man in the back seat of a police car last July because he was thrashing around and spitting.
The 53-year-old Ritchie was a 29-year police veteran. He was demoted from sergeant in 2004 for shooting a suspect 27 times with a stun gun.
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