MATTAWAMKEAG, Maine — Two men with previous drug trafficking convictions are again behind bars after the Maine Drug Enforcement Agency raided a Hathaway Road home on Friday and found about 200 doses of heroin, MDEA Cmdr. Peter Arno said Sunday.

Paul Bone, 30, of Dorchester, Massachusetts, and Ryan Schiller, 31, who is a relative of the person who rents the home that was raided, were both charged with aggravated trafficking in Schedule W drugs, which is a Class A crime.

“This charge was aggravated due to a prior drug trafficking conviction,” Arno said about the charges against both men.

Schiller also was arrested in March 2013 in Lincoln, after MDEA agents raided his residence there and allegedly found 34 baggies of heroin, valued at $7,000, according to Bangor Daily News archives. He was indicted by the Penobscot County grand jury in April 2013, charged with unlawful trafficking of scheduled drugs and five counts of unlawful possession of scheduled drugs.

The results of his 2013 drug charges were not immediately available Sunday.

The heroin trafficking investigation was conducted by the MDEA’s North Central Task Force, based in Bangor, which learned several weeks ago that Bone was bringing heroin to Maine that Schiller’s was selling from the residence, Arno said.

“This investigation included the undercover purchase of heroin,” the MDEA commander said.

MDEA agents, U.S. Drug Enforcement Agency agents, Penobscot County Sheriff’s Office deputies and Maine State Police troopers, raided the Schiller residence about 7 p.m. Friday and seized “approximately 20 grams (200 dosage units) of heroin and other evidence of drug trafficking,” Arno said.

Both Bone and Schiller were taken to the Penobscot County Jail in Bangor where they remained Sunday.

“This investigation is continuing and more arrests are possible,” Arno said.

Those with information about this investigation or illegal sale of drugs in this state, are asked to contact their nearest MDEA office or the MDEA tip-line at 800-452-6457.