business. man who knew too much. all videos that recently deceased judge john bork once rented. his rental history was leaked to the press. this privacy violation so outraged people, in 1988, congress made it a federal crime to disclose someone's video rental records. now numerous websites don't merely know what you've watched, but what you want to watch next. most people assume that the government can know a lot more than that. can they? claudia cowen reports. >> reporter: after the boston marathon bombings of april 15th where three were killed and hundreds injured, americans were asking, why hadn't the authorities flagged the suspects, dzhokhar and tamerlan