BANGOR, Maine — Police were called to a Stillwater Avenue residence recently to deal with a man on the synthetic drug bath salts who had threatened his girlfriend with a kitchen knife and then cut himself, Bangor police Sgt. Paul Edwards said Wednesday.

Jeremy Lau, 35, who has a long history of arrests, was locked in an upstairs bathroom with the knife when police officers arrived at about 6:40 p.m. Oct. 14. When they got inside the room, they found Lau bleeding from a self-inflicted wound, police said.

Lau told police he had used bath salts and “didn’t know what was going on,” Edwards said, reading the report written by Officer Joe Baillargeon.

“He threatened her and cut himself,” the sergeant said.

Lau was taken to Eastern Maine Medical Center, where he remained for two days. He was arrested upon his release from the hospital about 12:30 p.m. Oct. 17, and charged with felony domestic violence criminal threatening with a dangerous weapon.

The 31-year-old woman who was threatened did not need medical attention, Edwards said.

Lau, who lists his address as Manna on Main Street, where a substance abuse home is located, has a number of convictions on his record, some that included prison sentences, according to court listings printed in the Bangor Daily News.

Lau was convicted in March of criminal mischief and violating a condition of release and was sentenced to seven days in jail for both, to be served concurrently. Last year, he was convicted of operating a vehicle after habitual offender license revocation and sentenced to prison for 15 months with all but six months suspended, probation for two years and a $1,000 fine, the BDN listings state.

He also has convictions for unlawful possession of scheduled drugs; assault; failing to stop, remain, and provide information after an accident; refusing to submit to arrest or detention, four counts of violating conditions of his release and three counts of theft by unauthorized taking or transfer.

He was sentenced in 2005 to prison for four years with all but 10 months and 15 days suspended for aggravated criminal trespass. In August 2004 he was convicted of aggravated criminal trespass and sentenced to prison for four years with all but one year suspended, according to prior BDN listings.

Lau was taken to the Penobscot County Jail after his arrest last week and remained there on Wednesday, Edwards said.