>> able to do forensically in examining these packages that was key to this. but look, there's a lot of clues, as james can tell you, having done many of these investigations over the years. it's not just one thing, right? it helps that they were able to find the nexus in florida there, in that facility in opa-locka, where rosa flores has been reporting from. they were able to identify that that was a facility that processed many of these packages. that at least allowed them to narrow their focus and they were able to see that facility collects mail or processes mail to and from a specific part of the region. of south florida, of the miami area. so that was very, very helpful. then they, the forensics work was going on in quantico, in new york, to examine these packages, to look at the ones that did not -- that had not been detonated by the bomb squad. and with that, they were able to put together a lot of clues. there's a lot we're going to