here's keith snow with the conclusion of one small dose. >> reporter: tara fitzgerald's friends and familythat came too late to save tara from a synthetic drug overdose. >> we're not taught how dangerous it really is and how unstable the chemicals can be. >> the kids don't know how deadly these drugs are. there's not enough information that's being pushed out to the public. you hear a lot about things like heroin and cocaine and meth. but something like these synthetics is far deadlier in tiny dosage. >> reporter: prosecutors handling the first synthetic drug death in woodbury now had five defendants, including three high school students. the two adults, who knew they were selling 25i and profited from the drugs, were charged not with drug sales but with murder. why homicide? >> in minnesota, there's murder in the third degree. it's a pretty open statute that says, if you sell a substance, a schedule one or two substance, that leads to the death, you're guilty of murder. >> reporter: both adults pleaded guilty to third degree murder. the main supplier, alexander claussen, was sentenced to