Called 25i News Today : Breaking News, Live Updates & Top Stories | Vimarsana

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...

As lsd were really a synthetic drug called 25i. >> -- because people don't like that stuff. they think it's -- they know it's bad, you know? >> but you know it's 25i. >> yeah. >> had you ever heard of it before? >> never. we had never dealt with it before. >> reporter: 25i is a new chemical that was only made illegal in the u. s. two months before tara died. it can cause hallucinations, like lsd. but in tara's case, it also led to seizures, respiratory distress and ultimately, cardiac arrest. it sometimes goes by the street name, "n-bomb" or "smiles. " and detectives were about to show us the ...

To students at woodbury high. he admitted to police the tabs he was selling as lsd were really a synthetic drug called 25i. >> -- because people don't like that stuff. they think it's -- they know it's bad, you know? >> but you know it's 25i. >> yeah. >> had you ever heard of it before? >> never. we had never dealt with it before. >> reporter: 25i is a new chemical that was only made illegal in the u. s. two months before tara died. it can cause hallucinations, like lsd. but in tara's case, it also led to seizures, respiratory distress and ultimately, cardiac arrest. it sometimes goes by the s...