MARQUETTE — Four people are in jail after multiple drug busts by the Upper Peninsula Substance Enforcement Team this week.

On Wednesday, UPSET detectives conducted an investigation that led them to identify two people involved in the sale and distribution of marijuana in the City of Marquette. A male suspect was observed passing a large amount of marijuana to a female suspect in a parking lot near the intersection of McClellan Avenue near West Washington Street. Both suspects drove away from the scene, but were quickly stopped by Marquette City Police.

The man who allegedly delivered the marijuana to the other suspect was arrested for delivery of marijuana and lodged in the Marquette County Jail. Police say over an ounce of the drug was seized.

On Thursday, detectives arrested two people at a home on the 200 block of North 21st Street in Escanaba. A 42-year-old woman was arrested on an outstanding warrant related to an UPSET investigation, and a 46-year-old man was also arrested. Both are lodged in the Escanaba County Jail awaiting arraignment on two counts of delivery of suboxone.

Also on Thursday, UPSET conducted an investigation that led them to a residence on Fish Road in Mackinac County. Detectives determined there was an illegal marijuana operation inside the residence. A search turned up 19 marijuana plants, over three ounces of processed marijuana, and three handguns. A 66-year-old Mackinac County man was arrested for an outstanding warrant relating to a conservation violation and lodged at the Chippewa County Jail.

Detectives expect additional charges for the manufacture of marijuana and possession of firearms pending review by the prosecutor’s office.

Names in these cases have not been released pending arraignments.