Wall Street Journal :: When a crime occurs today, law enforcement must quickly and efficiently canvass online venues e.g. Twitter, Facebook, to capture and preserve evidence, much like the traditional door-to-door canvass that investigators historically conducted to identify and interview witnesses.
Written by [exclusive subscriber content] Cyrus Vance Jr., online.wsj.com
Cyrus Vance, Jr., The Manhattan District Attorney’s Office, on Twitter



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