Sandy resident Jason Owen responded to the Craigslist ad early last week, OSP said. The seller, who works for OSP in the Salem area, contacted his supervisor when Owen offered a pound of marijuana in exchange for the snowmobile. Several marked patrol cars then pulled him over in a traffic stop, OSP said. The Craigslist seller identified himself as an OSP trooper and told Owen his proposed trade was illegal. Troopers allegedly found 1.5 pounds of pot in his car.