as a source he had the capabilities of following through. >> joining us is one of the men you just saw in that clip. john archer. he's a supervisory special agent for the d.e.a. thank you for spending time with us. the arms dealer we're talking about here is monzer al-kassar. the takedown operation was more than two decades in the making. it's so interesting to pull down the curtain on something like this. how did the infill traitd finalfinal d.e.a. finally infiltrate al-kassar's inner circle? >> the a. have a number of unique capabilities that allow to us operate internationally. we're located in nearly 70 countries and employ over 15,000 informants who work at our behe behest. >> so can you tell us a little bit about then how you go in, how you make these relationships to ultimately hook somebody in order to just explode the investigation? >> yes. the biggest thing is the personal relationships that we