and explosives. our chief white house correspondent, jessica yellin, got a special inside look. anywhere? yeah, just get the paper lit real good. that s me, lighting the fire. fire forensics. on the bottom, everything starting to off-gas and catch on fire. one of the specialties of the bureau of alcohol, tobacco and firearms. this was the only fire laboratory of its kind in the world that does forensics type of evaluation. we toured the atf s maryland facility. where they have a tank for firing bullets. and the water doesn t leave any marks on the bullets. so it stays pristine. very csi. absolutely. a range to test guns used in crimes. it has 13 rounds and they re asking whether it did continuously fire and not jam. and lots of labs. a digital bullet lab to match