A 42-year-old Thomaston man who waged a six-year legal battle against Dragon Products over its dust emissions is behind bars after police arrested him for heroin trafficking.

Stephen Darney was arrested on the afternoon of May 10 at his Old County Road home, according to James Pease of the Maine Drug Enforcement Agency. Darney was charged with trafficking in heroin and possession of a firearm by a prohibited person.

Pease said 280 bags of heroin were seized at the home along with a 9 millimeter handgun and a shotgun. Darney is prohibited from possessing firearms because of a felony conviction for assault on an officer in the late 1990s in Massachusetts, the MDEA supervisor said.

Law enforcement had been investigating Darney for several months for selling heroin in the area, he said.

According to an affidavit filed in court, Darney confessed to police during the search of his home that he had been traveling to Rhode Island for the heroin and selling it locally. He told police he was using heroin, according to the affidavit.

A bail hearing was held Wednesday afternoon May 11 and Judge Michael Westcott set bail at $10,000 cash or $25,000 surety.

The district attorney’s office had asked for $5,000 cash bail and defense attorney William Pagnano had asked for $1,000 cash bail. Westcott noted that the value of the drugs seized was in excess of $10,000.

Judge Westcott asked if Darney’s children lived at home and when Darney said yes, Westcott commented “how to screw up your children.”

Kathleen Darney, 40, of Thomaston, was issued a summons for possession of heroin.

The Darneys filed lawsuits against Dragon Products, arguing that the dust from the plant and blasting done on Dragon’s property was harming their property. A federal judge ruled in March that the Darneys had not proven their case.

The couple purchased the home in 2002.