A Pennsylvania State Police corporal who supervises DUI checkpoints on Philadelphia-area highways faces disciplinary action after he allegedly got drunk and crashed his car while off duty in Montgomery County last month.

Cpl. John Quigg, 47, of Wyndmoor, is on administrative leave pending the results of an internal investigation, said Trooper Danea Durham, a state police spokeswoman.

Quigg was driving his Honda Accord west on Route 422 in Upper Merion just after 9 p.m. on Dec. 17, when he lost control and hit a guard rail, according to a police report.

The damage was minor because he'd been traveling at a low rate of speed, according to the report.

A responding trooper found Quigg slumped over and unresponsive in the driver's seat of his immobile car, according to the report. He was taken to Phoenixville Hospital for evaluation.

He was charged with driving under the influence and careless driving, and with an open-container violation, Durham said.

Quigg, a 24-year veteran of the state police, is a crash reconstructionist based at the Philadelphia barracks on Belmont Avenue, Durham said.

He usually oversees the barracks' DUI checkpoints on local highways including interstates 95, 76, 676 and 422, Durham said.

He also is a drug-recognition expert, meaning that he can determine what intoxicant a person is on by evaluating behavior and other factors, she added.