and after months of digging, they finally found the main supplier, 19-year-old alexander claussen.x, you have a right to remain silent. anything you say can and will be used against you in a court of law. >> reporter: the drugs were seized and the entire distribution chain involved in tara's death was finally shut down. just one final question loomed. what would happen to tara's classmates? the kids who expected to be going off to college soon, not prison? >> religiously, i want to forgive everybody. but as a parent, let me tell you, it's harder. it's very hard. >> coming up -- the stakes are about to go up. tara's classmates may be charged with no less than homicide. coming up -- >> if you sell a substance that leads to death, you're guilty of murder. >> what will that mean for tara's parents? >> is it justice? >> when "dateline" continues. >> when "dateline" continues. clr> or an unbearable itch. this painful, blistering rash can disrupt your life for weeks and could make it hard to be there for your loved ones. shingles could also lead to serious complications that can last for