Arthur Contreras is suspected of following a fellow bar patron into a bathroom, where the off-duty officer allegedly tried to stab the man in the chest but instead cut the man’s arm, the Los Angeles Times reported.

According to the Los Angeles Times, the 55-year-old officer was arrested about 3:15 PM Wednesday at a residence in Upland. He was booked into the West Valley Detention Center in Rancho Cucamonga on suspicion of assault with a deadly weapon, and was released after posting $40,000 bail, The Times reported.