BANGOR, Maine — Two Bangor residents pleaded guilty Wednesday to conspiracy to possess with the intent to distribute and to distribute MDPV, a synthetic hallucinogen commonly called “bath salts” or “monkey dust.”

Adam Hathorn, 36, and Tina Keaton, 32, also known as “Fumble,” entered pleas at U.S. District Court in Bangor.

According to court documents, the two illegally distributed MDPV in Penobscot County and elsewhere between April and December 2011.

Before Oct. 21, 2011, MDPV was classified as a controlled substance analogue. On that date, it was classified as a Schedule I controlled substance.

Hathorn and Keaton obtained quantities of MDPV from other members of the conspiracy in the Bangor area and then traded, sold or otherwise distributed them to others.

The defendants face up to 20 years in prison, a $1 million fine or both. They will be sentenced after the completion of presentence investigation reports by the U.S. Probation Office.

Hathorn and Keaton are two of 14 defendants charged as part of the conspiracy. A third defendant, Matthew Tardiff, 27, of Old Town pleaded guilty to the conspiracy charge on Jan. 27. He awaits sentencing.

The case was investigated by the Maine Drug Enforcement Agency with assistance from the U.S. Drug Enforcement Administration.