A 15-year-old Middletown student is facing a marijuana possession charge after a routine locker search at the high school uncovered a student was selling the drug in the hallways.

And the student’s arrest subsequently uncovered his alleged supplier, 36-year-old Alfred Dillingham, of Village Drive, according to Middletown police Sgt. David Birk. He was arrested and found guilty this past Friday of contributing to the delinquency of a minor.

Dillingham, who has multiple traffic and drug-related offenses including a felony drug conviction, was sentenced to 90 days in jail, and all but three days were suspended. However, he may reappear in Middletown Municipal Court as Birk said, “We’re talking with the prosecutor about other charges.”

During a routine search locker search on Feb. 20 at the high school at 601 N. Breiel Blvd., a drug-sniffing dog from the Trenton Police Department indicated a narcotic was in the boy’s locker.

Inside a black backback, two small baggies of marijuana were found. The student was called to the office and after he was searched a third baggie of marijuana was found.

The total amount of marijuana was 2.3 grams. According to the report, the boy was selling the drug for $5 a gram. A court date has not yet been set.

Middletown High School Principal Carmela Cotter said unannounced routine searches are important “so that we establish and maintain a safe and secure environment for all students.”

“It is unfortunate that a student chose to bring marijuana onto our property, which will not be tolerated,” she said.

Police searched the boy’s cellphone and found text messages indicating he would meet other students around 7 a.m. in the back hallway. There were also messages to and from Dillingham, Birk said.

A search of Dillingham’s residence found more marijuana and digital scales.

Possession charges on the students involved will be pursued, Cotter said.