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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...

After more than a year of discussions centering around the Olathe Public Schools district bell schedule changes, staff and parents provided a final recommendation on what the district should do.

Frascone and i are wearing gloves is, if you touch that, you could absorb that and become -- the drug in there could affect you simply by absorption. >> reporter: and when you take a closer look, it's easy to see how some tabs could be stronger than others. >> there's no way of knowing the amount of drug on this tab here and this individual tab here. >> they all look different. how would anybody know what they're getting? >> that is the biggest problem and our biggest concern is that this whole process is so unscientific. >> reporter: it's a problem that's become a national concern as well. ac...