The fall sitting of Dukes County superior court began Monday with a grand jury handing down two indictments.

John P. Hathaway Jr., 49, of Oak Bluffs was indicted on one count of trafficking in fentanyl, more than 10 grams, one count of possessing to distribute a class B substance (fentanyl), one count of possessing a class B substance (Buprenorphine), and one count possessing a class E substance (codeine and acetaminophen).

Mr. Hathaway was arrested in March after a police raid on a home on County Road in Oak Bluffs. The arrest followed a lengthy investigation into heroin and fentanyl distribution on Martha’s Vineyard. Police said they seized 54 grams of fentanyl during the raid.

Fentanyl is a synthetic opioid that is 50 times more potent than heroin, according to the Centers for Disease Control and Prevention. It is often mixed with heroin to increase the drug’s effect.

On Monday the grand jury also indicted Joshua L. Rogers, 30, of Oak Bluffs on two counts of purchasing or possessing child pornography.

The charges date to February 2017 in Oak Bluffs. According to court documents, Mr. Rogers was arrested in May following a cyber tipline report from a trooper with the Massachusetts Internet Crimes Against Children Task Force.

The Hon. Gary A. Nickerson is presiding over the superior court session, which also includes two criminal trials.

A jury trial is scheduled to begin Tuesday for Adam M. Smith, 29, of Berkeley, Calif., who was indicted in 2016 on three counts of rape and one count of intimidating a witness/juror/police/court official. Mr. Smith was arrested in September 2015 while visiting the Vineyard for a bachelor party weekend.

In court at the time, a Cape and Islands district attorney said the alleged victim and two of her friends agreed to return to a rental home in Edgartown where Mr. Smith and his friends were staying after a night out in downtown Edgartown. The alleged victim, who was 30 at the time, said she later went upstairs with Mr. Smith, became uncomfortable and tried to leave, and was allegedly held down and raped. She also said Mr. Smith allegedly threatened her with a gun.

A second jury trial is scheduled to begin Oct. 16 for William M. Clasby, 52, of Blackstone. Mr. Clasby was arrested in June 2016 and indicted later that year on six counts of rape and five counts of indecent assault and battery on a person with intellectual disability.

According to police, Mr. Clasby delivered magazines to Island retailers from the mainland on a regular basis, and specifically targeted the alleged victim. The alleged incidents began in October 2015, according to police.

Mr. Clasby was employed as a cook at the Edgartown house of correction between October 2012 and February 2014.

Several civil cases are also on the docket.

The superior court convenes twice a year in Dukes County, in October and April.