A northeastern Pennsylvania man says he's been stopped at least 20 times by authorities who have mistaken him for the suspect in a trooper's killing.

Thirty-nine-year-old James Tully of Canadensis says he was once held at gunpoint in an encounter that left him fearing for his life.

Tully walks to work through the rural search area because he doesn't own a car. He also wears a backpack, an item police believe suspect Eric Frein (freen) has also carried.

Police have been looking for Frein for more than a month. He's charged with killing one state trooper and seriously wounding another in a late night ambush.

Trooper Tom Kelly, a state police spokesman, said Thursday the agency investigates any formal complaints about alleged mistreatment. He says no such complaint has been filed.