Many people have asked why the parents of Littleton gunmen Eric Harris, 18, and DylanKlebold, 17, didn't know that their teen-agers were making homemade bombs and doing other preparations for the assault.
It is not known if Harris actually took the medication, and investigators said Wednesday early toxicology tests performed by the medical examiner's office showed no evidence of drugs or alcohol in the body of either gunman, Harris or DylanKlebold.