10/11/2009 11:00 PM EDT Source: University of Utah
According to newswise: "University of Utah engineers showed that a wireless network of radio transmitters can track people moving behind solid walls. See photo of the two researchers with sample transmitters. The system could help police, firefighters and others nab intruders, and rescue hostages, fire victims and elderly people who fall in their homes. It also might help retail marketing and border control." Here's a rather uninspired video of it at work. These are portable, hence deployable at 'need'.
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