up lots and lots of things that you say might be threats and none of them are, people lose confidence in the data. the old crying wolf syndrome. >> even big brother faces roadblocks. if the government wants to track you. it'sabili its ability to gather data like at this massive nsa data center your honor construction in utah will allow them to do it. >> that being said, people should be realistic. no human reader looking at e-mails. it's impossible. the human will only look at things interesting or important. >> reporter: and then the interaction between cold data and live humans where synergy takes place. for if the failure to connect the dots before the boston bombings was a case where the investigators misread the data, a different story when the authorities had a more specific idea what to look for. they combed through countless photographs and hours of