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invites a friend to sleep over. the next morning, she's dead. >> oh, my god! i don't feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of ...

>> a bright and beautiful teen invites a friend to sleep over. the next morning, she's dead. >> oh, my god! i don't feel a pulse. >> what in the world happened? how could this be? >> turned out this was no ordinary slumber party. >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> stories surfacing of a dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in you...

dangerous experiment. >> the main purpose of having the sleepover was to try it. >> an experiment that just might tempt other teens. >> we know it's entered our high school. >> why the clues in this mystery could save a life in your family. >> you have a lot of people watching "dateline" that need to talk to their kids. >> welcome to dateline. parents always worry there are so many dangers out in the world a teenager can face. but at a slumber party in your own basement? how could something deadly have found its way there? taken a bright, talented girl. and could it happen in your to...

Single day. you're talking about millions and millions and millions of packages. finding the one with the bad stuff in it, that's hard to do. >> reporter: but finding a website that's willing to sell and ship these chemicals straight to your doorstep, that's pretty easy. my producer found several websites where you can pretty easily buy and import a kilo, which is a few pounds, right? >> 2. 2 pounds. >> 2. 2 pounds. so, if she can do it, can anyone do it? >> well, she can't do it legally. but yes. if she can do it, anyone can do it. >> we didn't, by the way. >> oh, i'm glad to hear that. i wou...

Package. they're reasonably savvy in the way they package it, and you can only imagine how many packages are transiting our borders every single day. you're talking about millions and millions and millions of packages. finding the one with the bad stuff in it, that's hard to do. >> reporter: but finding a website that's willing to sell and ship these chemicals straight to your doorstep, that's pretty easy. my producer found several websites where you can pretty easily buy and import a kilo, which is a few pounds, right? >> 2. 2 pounds. >> 2. 2 pounds. so, if she can do it, can anyone do it? >>...