investigators quickly realized the smaller set was a likely match for jess loyd's boots.eld? no one's going off road into the field? they soon nails the tire type. they were -- . because there were reports that an suv in the park in that field the night just lloyd vanished, they could narrow down the make of the vehicle. >> from the wheel base, they narrow down that there were three possible makes it could've been. >> only three makes. a toyota forward run, or a jeep cherokee, and a nissan pathfinder. but which one? could they track it down? on thursday february 4th, a week after jess floyd went missing. the police set up a roadblock at a busy highway in front of her home. stopping cars. one officer, turning up the driver. another, checking tire trails. afterwards, the police called andy. they had made some discovery. >> they just said, we found something that possibly could be very very crucial. and that's all that we knew. >> soon after, teams of officers went door knocking on the highway. in front of the residents. and marcy koch lived five miles down the road. her fri