Chris_Halkides
Penultimate Amazing
- Joined
- Dec 8, 2009
- Messages
- 12,574
plausible scenarios
Machiavelli,
I did not say that the defense asked for further testing of the towels (poor storage has rendered the towels less useful than they would have been). The amount of Raffaele's (putative) profile was in the ballpark of 100-200 picograms of DNA. I am not sure where your "many dozens of skin cells" idea comes from.
The scenario Katy_did proposed and which I modified involved transfer from the towels to the clasp on the assumption that the bra clasp was stepped on wihile covered by the towels. Katy envisioned one extra step involving Rudy's shoe. This would not be contamination, but it would be secondary or tertiary transfer. It is just one scenario; contamination could have happened by several means. If the prosecution would release the egrams of the negative controls, it would be a start toward ruling out contamination. However, given the way the clasp was handled, contamination during collection remains quite plausible.
So your theory is: Raffaele left a DNA trace on a towel, a towel was used on Mederith and this towel transferred Sollecito's DNA on the bra clasp (meanwhile this had been cut and fell was covered by the pillow btw).
I don't know what Katy_did proposed but I don't see any reasonable theory for such a transfer.
I note 1) this theory would rule out forensic contamination; 2) Sollecito's defence didn't propose this theory, and didn't request further DNA tests on the towels; 3) a relation between the towel and the metal hooks of the bra clasp would be obviously weak: for a towel to carry and then deposit one DNA trace right on that point is simply an unlikely dynamic and a remote hypothesiys.
There were many dozens of skin cells dried, presed and adhering to the metal surface. Describe this finding in a realistic dynamic. The obvious and almost the only explanation is somebody touched the item.
Machiavelli,
I did not say that the defense asked for further testing of the towels (poor storage has rendered the towels less useful than they would have been). The amount of Raffaele's (putative) profile was in the ballpark of 100-200 picograms of DNA. I am not sure where your "many dozens of skin cells" idea comes from.
The scenario Katy_did proposed and which I modified involved transfer from the towels to the clasp on the assumption that the bra clasp was stepped on wihile covered by the towels. Katy envisioned one extra step involving Rudy's shoe. This would not be contamination, but it would be secondary or tertiary transfer. It is just one scenario; contamination could have happened by several means. If the prosecution would release the egrams of the negative controls, it would be a start toward ruling out contamination. However, given the way the clasp was handled, contamination during collection remains quite plausible.