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NOVA follows the manhunt step by step, examining the role modern technolog combined with old fashioned detective wor played in cracking the case. 

Given hundreds of hours of surveillance and bystander videos, how did agents spot the suspects in a sea of spectators? Why couldn,t facial recognition software I.D. the criminals? 

How much could bomb chemistry analysis, cell phone GPS, infrared imagery, and crowdsourcing reveal about the secrets behind this horrific crime? With the help of top criminal investigators and anti terrorism experts, NOVA explores which technological innovations worked and which didn,t.



















nova.s40e19.manhunt.boston.bombers.hdtv.x264-qcf