in 1990. for the nypd. frank, walk us through how you go from, if you have from the federal level, fbi level, if you have the firearm, and you have the magazines, walk us from there to how you find the person. because, as you this person is a person of interest. it doesn t mean that they did it. we keep showing his picture. it doesn t mean he necessarily did it. it means they re looking to talk to him. but how do these investigations proceed at the federal level since the fbi is helping, but would they be doing right now? fbi had atf particularly. there is a treasure trove that has been found at this crime scene. the gas mask is going to have fingerprints, even possibly think about taking on and off a gas mask. you are bringing hair, even perspiration, you re putting your fingers on it. you are leaving a trail. now let s go to the gun. again, we have a clock brand,