An Oakland man who allegedly sold $500 worth of fentanyl to an informant working with Maine Drug Enforcement Agency was arrested Wednesday on a charge of aggravated trafficking in schedule W drugs.

Brian Ouellette, 52, allegedly sold 5.8 grams of the synthetic opioid to the informant, who purchased the drugs using money provided by the agency, according to court documents.

An affidavit filed by Jordan Brooks, a special agent with MDEA, states the informant called agents and said they could buy a “half stick of down” from Ouellette. The affidavit states “down” is a street term to describe heroin or fentanyl and “stick” refers to a 10-gram portion, which is approximately the size of a thumb.

The informant called Ouellette who told them to come to the garage of a Smithfield Road home. An undercover MDEA agent drove the informant to the site and parked in the driveway of the home as the informant went into the garage. The informant returned a short time later with a tin foil package containing what the affidavit states tested positive for fentanyl.

The trafficking charge is a Class A felony, punishable by up to 30 years in prison.

The alleged crime was elevated to “aggravated” trafficking because Ouellette had been previously convicted of unlawful trafficking in scheduled drugs in 2014.

Ouellette was taken to Kennebec County jail with bail set, initially, at $15,000.