Four Monroe County men face drug charges after one of them sold heroin/fentanyl to an undercover officer at the Wawa on West Main Street in Stroudsburg, according to the Monroe County District Attorney’s Office.

Zachary Herbst, 26, of East Stroudsburg is accused of selling five bags of the drugs to an officer on April 10.

In the car with Herbst at the time were his mother, Sheila Conway, 45, of East Stroudsburg, Justin Conway, 41, of Saylorsburg and Robert Sampson, 46, homeless.

The District Attorney’s Office said the investigation into Herbst began in February when the Monroe County Drug Task Force became aware of Herbst making frequent trips to Paterson, New Jersey, and Kensington, to obtain drugs which he would bring back to Monroe County for personal use and distribution.

An undercover officer started communicating with Herbst.

When the four were taken into custody on April 10, Herbst told investigators they had returned items to Walmart that morning and got a gift card.

Once they had the gift card, Sampson sold it for Herbst. The four took that money and went to Paterson, New Jersey, to buy what Herbst told investigators was fentanyl.

Herbst told investigators that they all used the fentanyl on the ride back from Paterson.

When police took the four into custody bundles of drugs were falling out of the vehicle, police said. When the vehicle was searched investigators found just over four bundles of heroin/fentanyl, all bearing the same stamp of the bags Herbst sold to the officer.

Charges were filed by Detective Kim Lippincott of the Monroe County Office of the District Attorney.

The four defendants are in the Monroe County Correctional Facility in lieu of bail. Preliminary hearings are scheduled for 10 a.m. April 24.