Mar 25, 2003 — Just a few years ago, New York's border with Canada was little more than a line on a map. Since September 11th, state and federal officials have spent moved aggressively to tighten security. Governor George Pataki is now sending 120 new state troopers to help patrol the 400-mile frontier. New technology is being installed at major crossings - including massive x-ray machines and radiation detectors. As Brian Mann reports, the policy marks a major shift, at a time when relations between the two countries are already strained.