BART and Hayward officers detained a male suspect for reportedly battering his girlfriend in the concourse area of the station. An independent witness identified the suspect as the responsible, and he was placed under arrest for domestic violence. The suspect was then issued a prohibition order and served with an emergency protective order before being booked into the county jail. The victim, who sustained minor-to-moderate arm and facial injuries, was transported to a local hospital for further medical treatment. A sergeant responded to supervise the investigation and approve the arrest.