A San Francisco police officer was arrested Monday on sexual assault charges following an investigation by internal affairs, according to authorities.

San Francisco Police Department officials said that the investigation into Officer Justin McCall began in September of last year when the Internal Affairs Criminal Division was notified of possible criminal conduct committed by McCall while off duty.

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When the investigation began, McCall, age 30, was removed from his assignment in the field and assigned to a position where he did not have contact with the public.

Upon completion of the investigation, an arrest warrant was issued for McCall, a San Francisco resident and a four-year veteran of the SFPD. On Monday at approximately 1 p.m., McCall was arrested and booked into San Francisco County Jail.

McCall faces charges of sexual assault when the victim is prevented from resisting by an intoxicating substance and for sexual assault of a victim who was unconscious or asleep. McCall has been suspended without pay pending trial.

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