you not to glorify and create sensationalism for him. he in no way deserves this. focus your attention on the victims and the families and helping them get through this difficult time. >> let's get more now from the former atf executive at the department of alcohol, tobacco and firearms. he's currently an official with fjc security. he joins us now from the cnn center in atlanta. let's just use some of your experience here. we're told that the atf right now is trying to trace back the weapons used here, trying to work out how the gunman on tand the three handguns, as well as the rifle how do they do that and why is that so important in this investigation. >> we have a system, we have a tracing system. we're the only organization in the world that has this