Maine drug agents are looking for a suspect who they believe operated a methamphetamine lab in a mobile home in Penobscot County.

The Maine Drug Enforcement Agency broke up the lab in Greenbush on Tuesday evening, said Stephen McCausland, spokesman for the state Department of Public Safety. It is the 40th meth lab incident in Maine so far this year, topping the previous record of 37, set last year.

McCausland said in a press release that agents have been investigating suspected drug activity at the mobile home on Main Road, part of Route 2, which runs north from Old Town through Greenbush. When they entered the home around 8 p.m. Tuesday, they found evidence that methamphetamine was being manufactured there.

Officials are seeking a suspect who was staying at the mobile home but is not the owner, McCausland said.