Rosie - I'm reminded of a TV series here called "Dexter". When a police officer catches his son Dexter killing and abusing animals he's convinced that his adopted son shows all the signs of becoming a serial killer. So he trains the boy on how to channel his emotions and dealing with it in an "acceptable" way. By killing other serial killer. Dexter grows up to be a forensics expert for the Miami police. And saves blood samples from all of his victims. It's a twisted series - and it has a suprising amount of humor in it. How they were able to make a TV series out of such a dark subject is beyond me.