. >> chuck rosenberg is the administrator of the dea. >> you're talking about an industry killing our dea said the synthetic drug problem in the u.s. originates far outside our borders. >> the chemicals come from abroad and often processed and assembled and packaged here. >> are most of these chemicals coming from china, is it fair to say? >> most of it's coming from china. >> in china for the most part, it's been perfectly legal to manufacturer and sell most synthetic chemicals. over the last seven years the china pipeline, as it's called, has made so many of these chemical compounds it's created a whole new world of drug dealing. a world where drug makers and dealers rarely meet and where drug buys take place online. >> how easy is it for someone here in america to buy these chemicals? >> too easy, extremely easy. somebody sits down at their keyboard, orders it over the internet and comes in a package. >> they're reasonably savvy how they package it. you can only imagine how many packages across our borders every day. you're talking millions and millions of packages. finding the one