An excellent scientific analysis of the knife and bra clasp can be found here.
The knife bothers me a lot. Logically, if the knife was cleaned so well that even luminal fails to finds traces of blood, how the hell was skin DNA left behind?
The fact that the bra clasp was not recovered for 47 days, and contains DNA from a variety of unknown donors, seems to limit its probative value in this case.
DNA can tell you many things, but it can't tell you HOW it got there, or WHEN it got there. The small amount of DNA on the blade could have gotten there at anytime either before or after the murder, which makes it's probative value non-existent. How this counts as "evidence" is beyond me.
Friday, December 11, 2009
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