Super Bowl 2012 Security Patrols Use Robots, Toxin Monitors, F-16s

"In addition to air patrol, on the ground police use giant x-ray machines to scan every vehicle arriving at the stadium, and surveillance cameras, which allow officers to monitor both the interior and exterior of the stadium. The videos are streamed into command centers set up throughout the area nearby. Hidden monitors test the air for toxins and biological weapons, and police patrol with portable radiation detectors."