[mrscolumbo]

Apparently there is now a forensic psycholgist, not the A & S profiler, who is suggesting that the killer of Joanna may have killed before - because of the lack of forensic evidence in this case the killer may have 'forensic awareness' and after the murder obliterated all forensic evidence of the crime!

Could it not simply be that the killer would have no real need to obliterate the crime scene of forensic evidence to eliminate him of the crime - if the crime scene is a place that would normally & naturally have a mixture of dna from both the victim and the perpetrator.