CNET News Video: Facial recognition cuts investigation time down to seconds1:38 /
In the wake of the Boston Marathon bombings, police have been poring over surveillance footage and amateur video and photos in the search for evidence. Just a few years ago, this process would have taken hundreds of investigative man-hours. Now it takes just minutes or even seconds, thanks to technology like facial recognition and object tracking. CNET's Kara Tsuboi reports.