As he drove over the Montana state line April 7, Michael Roe had one eye on the odometer of his Chevrolet Cavalier and one on the rock piles along the U.S. Highway 2 shoulder. This was a day 15 years in the making, one buoyed by a lot of blood, sweat and, well, urine, really, more than sweat. Roe, 41, is a rural route driver for Pathology Associates Medical Laboratories. He logs more than 1,300 miles a week collecting bodily fluids between Spokane and Troy, Mont.