Raleigh, N.C. — A state Highway Patrol Trooper has resigned following suspicions that he was driving while impaired while on patrol.

Trooper Christopher S. Grubbs, 34, was pulled over by Montgomery County sheriff’s deputies Friday evening in a construction work zone after a worker reported Grubbs acting strangely in his car.

Deputies did not charge Grubbs but turned the case over to the Highway Patrol. He was place on investigative leave Saturday and resigned Monday, Patrol spokesman Lt. Everett Clendenin said.

The case is still under investigation.

Grubbs, 34, was sworn in as an officer in May 1995 and was stationed in Troy. He is the second trooper this month involved in an alleged DWI.

Steven Ellis Bradley, 38, was charged Dec. 4 with DWI and assault on a law enforcement officer after he crashed his personal vehicle in a pond in Raleigh. An internal investigation is also under way in that case.