But they are serious social path killers.
Karla Homolka (http://en.wikipedia.org/wiki/Karla_Homolka)
On December 23, 1990, Homolka stole the animal anesthetic, Halothane, from the veterinary clinic where she worked. Together she and Bernardo administered it to her fifteen-year-old sister Tammy Lyn Homolka along with a mixture of alcohol and halcion. They raped/video taped Tammy in the basement of the Homolka family home while she was unconscious. Ya see paul wanted a virgin so Karla drugged her own 15yr old sister so he could have one.