i think she s trying to kill me. reporter: the woodbury, minnesota, police department was trying to find out how one small dose of a drug killed 17-year-old tara fitzgerald. tara thought she was taking lsd, but the local drug task force team suspected she d taken something else. we re pretty sure it s some type of synthetic drug, either that we ve heard about or don t know about. a synthetic drug? yes. reporter: the term synthetic drugs refers to a new class of narcotics developed in just the last seven years. they are made from chemicals that can be unpredictable, and are sometimes sold masquerading as other, better-known drugs. tara s case was the first time police in this suburb were dealing with a synthetic drug death. and tara s friends say they knew little, if anything,