i talked to ross mcnutt of this company that does this, persistent surveillance systems.listen. >> a city the size of dayton, we'll see eight to ten times emission. in a city similar to chicago with 670 crimes per square mile, we expect to see 30 to 40 crimes a mission. >> and the mission is about six hours. >> the mission is about six hours. and we're able to give you the tracks of where these people come from and go to. >> ross mcnutt says they have witnessed a total of 34 murders, wolf, and gotten confessions that account for 75 murders. >> so it's sort of like in the sky closed circuit tv video cameras that could record what's going on. and is investigators can later look at it and get some evidence. to they think this is going to reduce crime? >> they do think it will. they think that just when people know in a given city that these things are up there, it might deter crime. the police chief of dayton, ohio told us, he wants to bring in young people who might be, you know, predisosed to commit crimes and watch -- to see this technology at work, and say, look, you' lo