John Rabago said in court that he told the man, identified in court by his initials S.I., that he wouldn't arrest him if he licked the urinal. The man knelt down and put his head in the urinal, Rabago said.
Rabago and another officer had responded to a nuisance complaint when they found the man in a stall in the restroom. The man was uncooperative and initially gave a fake name, Rabago said.
The man told Rabago he would do anything not to get arrested. Rabago said he told him, "If you lick the urinal you won't get arrested."
Rabago said he threatened the man in an aggressive tone.
Rabago, who remains on restricted duty, and Reginald Ramones, who left the department in August, were arrested and charged earlier this year with conspiring to deprive the man of his civil rights. Ramones pleaded guilty in September to a lesser charge that he knew Rabago committed a civil rights violation but didn't inform authorities about it.
U.S. District Judge Leslie Kobayashi said Rabago's threat wasn't a mistake or miscommunication. "You knowingly and willfully forced S.I. to lick the urinal," she said.
The homeless man feared he would be arrested and reluctantly obeyed Rabago's orders, according to court documents. Rabago had previously threatened another man he was questioning by saying he wouldn't be arrested if he stuck his head in a toilet, court documents said.
Ramones previously said in court that Rabago persuaded him not to tell authorities what happened in the public bathroom and to delete their text messages about it.