LondonJohn
Penultimate Amazing
- Joined
- May 12, 2010
- Messages
- 21,162
We have the bizarre logic of Hellmann that Amanda’s DNA on the knife handle is ‘strong’ but ‘Mez' is ‘contaminated’.
This one short sentence is as good a primer as any to the immense ignorance and scientific illiteracy underpinning this particular set of "arguments".
It's stupid and fundamentally incorrect to make the above statement. On top of other environmental and situational factors, the sheer relative quantities of DNA make it perfectly possible (and scientifically credible) to postulate that one person's DNA profile being found on a particular object is likely the reliable result of primary contact, while another person's DNA being found on the same object is massively unreliable and more likely to be the result of contamination than any genuine primary contact.
In the matter of the knife in this case, Knox's regular PCR-level DNA almost certainly showed up on the knife as a result of primary contact (which is entirely explainable in the context of Knox using the knife to prepare food in Sollecito's apartment); in contrast, MezzaWezza's DNA profile* most likely appeared on the blade as the result of contamination, owing to the super-low-template nature of the alleged quantities involved**
* If it was indeed MezzaWezza's true profile: not-a-real-doctor Stefanoni was incompetent in her work, and was unable/unwilling to provide vital source electronic data, including negative controls, to enable her analysis to be checked.
** We don't know the true nature of the super-low-template levels involved here, because incompetent not-a-real-doctor Stefanoni didn't undertake a proper quantification.