Good Question: How Do Investigators Analyze Huge Amounts Of Video?

On Wednesday night, officials in Boston said they think they have an image of the marathon bomber. They've been pouring over an incredible amount of video and pictures. It made us wonder: How do they analyze that much video? Jason DeRusha reports (2:58).  <br><br> <br /> <em>WCCO 4 News At 10 – April 17, 2013</em>