The frequencies employed by law enforcement and first responders can be a source of vital information in emergency situations but you can't tune in using any old radio. But rather than spend big bucks on a conventional police scanner, you can easily create your own for less than $20 with this (pretty technical!) guide from Instructables member Harrison Sand.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/GBDnOJHXyXs/watch-the-watchers-with-this-diy-police-radio-scanner-1447760784Tags: Ray Rice Chucho Benitez
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