. >> reporter: chuck rosenberg said most thin sinnsynthetic drugs come from china. how s sseasy is it for someone in america to buy these chemicals? >> too easy, extremely easy. somebody sits down at their keyboard, orders it over the internet and it shows up in a package. >> reporter: they're then transformed into many forms, pills, even liquids. and the drugs are a lot more dangerous than they look.. in factct thehemicals are so potent, they haha toandle them with gloves. >> the reason that detective and i are wearing gloves is if you touch it, you can absorb that and become -- the drug can affect you just by absorption. >> reporter: if i pick up that piece of paper, i could get it through my skin. >> for sure. yeah.. >> reporter: wow. >> that was kate snow reporting there. you can see more of her report on "dateline" tonight at 7:00, >>> up next, our sunday story from the fashion designer who dresses celebs like beyonce and rihanna to the cast of frieies, together once again. then, harry smith taking us behind the scenes in one of broadway's newest shows. it is a