While the teacher has not yet been found, the Reaper brings powerful tools to the search. Reapers can fly for hours, and the camera pod underneath it can capture both normal light and infrared, which is especially valuable when looking for warm body in a giant forest. Edward Cavanaugh, the 46-year-old high school teacher from San Francisco, hasn’t been seen since July 17th. The Reaper scanned part of El Dorado National Forest, which covers over 930 square miles in Eastern California, near Lake Tahoe. That’s a huge area to search, but the full-size drones flown by the military are designed to look for people in just those circumstances.