Officers arrested Alfonso Flores in May on suspicion of misdemeanor battery against his wife.
Investigators say the incident happened at the Espana's Restaurant in Los Banos.
The officer's wife initially reported Flores assaulted her during an argument, but did not injure her. She later said her husband only grabbed her purse and never touched her.
Flores was placed on paid administrative leave, but is now back at work. An internal affairs investigation is still ongoing.