tonight we have exclusive pictures of actual makeshift labs raided for making fake viagra and levetra. we want you to make sure you don't buy the counterfeits and putting your health at risk. >> reporter: this dirty warehouse is when investigators busted counterfeiters making fake viagra in china. it's just one of a series of raids all over the world that uncovered counterfeit pill making operations. in ecuador, boric acid was one of the ingredients. in columbia, pills were made with sheet rock and rat poison. >> if you're taking a pill that has rat poison, lead, boric acid, you could become very ill from that, possibly have a fatal complication. >> reporter: us customs are seizing mail. in 2010, agents nabbed 330 shipments of fake erectile function drugs. so far this year, the number stands at 1200. >> a lot of these drugs are ordered over the internet from what appear to be legitimate pharmacies and are shipped directly to patients. >> reporter: can you tell which viagra tablets here are real? the ones on the right are authentic. the fakes are on the left. sometimes knock offs look