A federal jury found Lucas Sirois, 45, of Rangeley, guilty Tuesday on all charges related to an illicit marijuana operation in Franklin County. His father, Robert Sirois, 71, of Farmington, was found guilty of one charge and acquitted of another, according to Assistant U.S. Attorney Andrew Lizotte.

The jury began deliberation Tuesday after closing arguments in the four-day trial in U.S. District Court in Bangor.

Lucas Sirois was found guilty of conspiracy to distribute controlled substances and possession with intent to distribute controlled substances. He was also found guilty of bank fraud, conspiracy to defraud the United States and impede and impair the IRS, tax evasion, and three counts of maintaining drug-involved premises in Farmington and Avon.

Robert Sirois, a convicted felon for previous marijuana violations, was found guilty of conspiracy to distribute controlled substances and acquitted of possession with intent to distribute controlled substance.

The Siroises were two of 12 people charged in an illicit marijuana and distribution case in 2021 after the U.S. Drug Enforcement Administration raided a former shoe shop on High Street in Farmington and other businesses connected to Lucas Sirois in Farmington and in Franklin County.

Two former law enforcement officers had their cases dismissed. Two other former Franklin County Sheriff’s deputies pleaded guilty in the case. A former Franklin County assistant district attorney was found guilty of tampering with documents but was not involved in the actual illicit marijuana grow operation.

A release from the U.S. Attorneys Office in 2021 said the operation realized in “excess of $13 million over a six-year period through the illicit sale of marijuana.”