A California correctional officer faces charges after allegedly hitting a handcuffed man in an assault that prosecutors say was recorded on surveillance .of correctional officer Matthew Mettler, employed by the San Joaquin County Sheriff’s Office, striking a restrained man in a spit hood has the district attorney’s office on the lookout for other instances of assaults by police officers.The San Joaquin County District Attorney’s office released a soundless clip that it says shows Officer Mettler walking up to a shackled man in a spit hood that covered the man’s entire head. The footage shows the man with his hands cuffed behind his back seated against a wall.The officer then strikes the man on the side of his head with his hand. The force makes him fall over and slump to the floor.