dayton, 2012. they get word of a burglary, track the suspect in the white truck as he's getting away and direct police right to him. dayton's police chief says the technologies helped his depleted force. >> allows us to gain data on criminal offenses for which there are often not witnesses and clearly police officers are not there to prevent. >> reporter: but privacy advocates say this smacks of big brother. >> they might have actually crossed a line. this creates the opportunity after the fact to look at anybody for any reason. >> we're responding in support of law enforcement to reported crimes only. >> reporter: and mcnutt says they closely monitor their own analysts to make sewure they're only tracking suspects. despite the controversy, ross mcnutt says police departments in ten different cities around the world are interested in buying his system to use on a permanent basis. brianna? >> wow were saying before that just from that one, the images you were seeing of the one gangland murder in juarez, maybe