michelle frascone was the lead detective. >> how do you explain that? >> terrifying.ething we had to look at. why do we have one that's able to communicate with us a few hours later, sittin' in an interview room, and we have one that's going to autopsy? our first thing was to talk to the friend, who provided us quite a bit of information from that evening, at least a decent timeline. we did phone forensics immediately. >> what did that tell you about what happened after midnight? >> we know from their phones that this was a planned event. they had discussed it. they took pictures. >> this is a photo of tara, taken just moments after she took the drug. and that's what an actual l-s-d tab looks like. it was unclear to detectives whether those are two tabs or one tab that came apart. >> the reason they had selected the night of the 10th was because tara's parents were gonna be gone in the morning for a sporting event for her sister. and, so, this was gonna give them time to recover. >> tara and her friend had planned it all out, even arranging to have another friend on s

we need to do a lot more, them, us, everybody. >> reporter: and at home, detective frascone suggests parents start respecting their kids' privacy a little less and start snooping around a lot more. >> go through their stuff. search their stuff. >> that's hard, though. >> it's hard. what about their privacy? they're teenagers. >> there is an element of privacy with teenagers. however, you don't want me showing up at your door. if the difference is an upset kid and you know what they're doing or them being in a casket, i guess i'd choose the upset kid. >> i wish i would've gone downstairs. because i would've probably detected something off with those girls, but i didn't because i didn't want to infringe on their space. >> reporter: tom and mai's greatest hope is that other parents will learn from their loss and become more aware of the risks. >> we all feel immune to drugs because our kids are better than that, they know better. they're not going to do this. they're going to be smarter, and it's not going to happen to us. >> reporter: tara's friends are in college now and think of her

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