DARTMOUTH — The second of the two town employees allegedly involved in a three-year drug operation at Town Hall has resigned, a town official said.

Paul Andrade, 42, of Fall River resigned June 4 from his position with the Dartmouth Water Department, Town Administrator David G. Cressman said in an email to The Standard-Times.

Andrade was allegedly involved in the diversion of his suboxone prescription with another town employee, according to court documents in New Bedford District Court.

The other employee is identified in court papers as Carolyn Oliveira, 58, who worked in the town collector's office. Oliveira also has resigned, too, Cressman said.

Suspicions about the possible sale of drugs in the parking lot at Town Hall caused Cressman to contact now Acting Dartmouth Police Chief Brian Levesque, the town administrator has said.

Dartmouth police conducted surveillance and observed Andrade pulling up in his town vehicle to Oliveira's personal vehicle in the parking lot and dropping off a "package" inside the driver's side door and taking money that had been left there, court documents said. The activity was conducted on Thursdays, Oliveira's payday.

Two Dartmouth detectives intercepted the final transaction on April 27.

Andrade told police he sold Oliveira some of his suboxone prescription for $10 a strip, court documents say. He would sell her about 52 strips a month for $520 and had been selling to her for “probably about three years.” He said his prescription is for 60 suboxone strips a month and sometimes he would leave the drugs in her vehicle and other times she would pick them up at his home.

Police also spoke with Oliveira and she said she has been buying suboxone strips them “on a monthly basis for some time now.”

An assistant clerk magistrate in New Bedford District Court found probable cause to believe a crime had been committed against Andrade, but did not find probable cause against Oliveira.

Andrade is scheduled to be arraigned Monday in New Bedford District Court on charges of distribution of suboxone and conspiracy to violate the drug laws, according to court records.

Follow Curt Brown on Twitter @CurtBrown_SCT.