A former Seabrook, New Hampshire police, Mark Richardson, accused of slamming a suspect's head into a wall while in custody went on trial Tuesday.This video is pretty damning. It clearly shows Officer Richardson slamming the suspect's head into a wall. This was back in 2009. He was charged with simple assault.

Three other officers were already disciplined after the incident. Police say the suspect was uncooperative after being arrested for OUI and drug possession. Opening statements were held yesterday in Brentwood.

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