The U.S. Department of Homeland Security already is using unmanned aircraft to patrol the Arizona border for illegal immigrants. Pictured here is the Israeli-built Hermes UAV, which has a price tag of around $2 million. It can fly in a radius of 120 miles for 20 hours at a cruising speed of about 90 miles an hour. Sensors can include GPS navigation, daylight video imaging, infrared imaging, laser ranging, radar, and GTMI (Ground Target Motion Indicator) analysis.
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