Geek 'Vigilantes' Monitor Border By Michelle Delio | Also by this reporter Page 1 of 1 02:00 AM Nov. 22, 2002 PT A group of tech-savvy ranchers in Arizona is using military technology to monitor and apprehend illegal immigrants crossing the border from Mexico into the United States. Members of the group have spiked their land with thousands of motion sensors. They also use infrared tracking devices, global positioning systems, night vision goggles, radar and other gear to survey movement near the border. http://wired.com/news/politics/0,1283,56523,00.html