A 20-year-old man was arrested after his neighbors at a North Charleston apartment complex told authorities that he was knocking on doors while drunk, calling himself a detective and investigating drug activity.

Luke Joseph Westbury, 20, of Patriot Boulevard, faces charges of impersonating a police officer and being a minor in possession of alcohol.

An officer from the North Charleston Police Department was summoned to the Appian Way Apartments around 1 a.m. Saturday. A resident told the officer that a man in khaki shorts greeted her at the door and asked if she had seen anything suspicious. The man called himself a detective but couldn’t provide any identification, she said.

The woman added that the man’s eyes were bloodshot and that he was unsteady on his feet.

After fielding the report, an officer spotted a man fitting the suspect’s description sitting on a third-floor balcony of a nearby apartment building.

The officer wrote that Westbury answered his door carrying an open bottle of Bud Light Platinum and that Westbury, who is underage, continued drinking from it while speaking.

“Westbury then stated that there was a lot of suspicious activity in the area and several drug dealers lived in the area,” the report said. “He had knocked on the doors of several residences in an attempt to contact the ‘suspicious person.’ ”

Westbury acknowledged identifying himself a Dorchester County Sheriff’s Office deputy. He was later jailed at the Dorchester County Detention Center.

Westbury has only one previous arrest on misdemeanor charges of loitering and violating a town ordinance.