Therefore, what Vecchiotti was saying was as follows: "I tested the knife in exactly the same place as Stefanoni alleges she found Meredith's DNA, and I found no human DNA at that spot but instead I only found starch."
Vecchiotti is NOT saying: "I retested Stefanoni's original 36I swab, and found no human DNA but instead only starch".
With all that in mind, let's revisit what Dempsey wrote:
Now, this is correct in as much as Vecchiotti swabbed at exactly the same spot - this small speck on the blade - and found no human DNA but only starch. But it doesn't technically mean automatically that Stefanoni's original 36I swab also must have contained no human DNA but only starch.
No I right and Dempsey is wrong. Neither the independent experts or the defense experts ever said that the material Stefanoni tested and attributed to Meredith was starch. NO ONE EVER SAID THE MEREDITH DNA ON THE KNIFE WAS STARCH, PERIOD. It not only doesn't technically or automatically (whatever that means) mean it was starch it doesn't in any way say that. C&V say that it can't be judged to be there from a non-contaminated source.
What you are saying is that if they had found DNA on a bra clasp and when testing it again they found only cotton that now the DNA was proven to be cotton.
So, as I say, Dempsey is somewhat imprecise in her writing, and has implied a false conclusion in my opinion (that Stefanoni definitely couldn't have found Meredith's DNA on that spot on the knife, since it was actually only starch). But she IS partially correct.
Nope. Had Stefanoni found the material in the crevice, extracted it, tested it, found DNA and had all of the protocols been followed then someone retesting it later only finding starch would in no way mean that the DNA was now judged to be starch.
Was the DNA of Meredith found by Stefanoni found to be starch by C&V? No, period. Stefanoni herself said there was no more genetic material on the knife (she seemingly missed AK's) so C&V not finding more on the MK spot meant nothing.
I guess she could have been less precise by saying it turned out to be Uranium 238
(Incidentally, Vechiotti could - and perhaps should - have avoided much confusion by giving her swabs slightly different labels. For example, her swab from that speck on the knife could have been labelled 36I(V), so as to distinguish it as the swab Vecchiotti took as opposed to the original 36I swab that Stefanoni took from the same location.)
Yes they should have. Maybe they should have them uncontaminated samples

.
LJ your effort is appreciated.
Had she said that the independent experts could only find starch on the knife that would have been imprecise and misleading given that the issue was that the police could only find the tiny amount they destroyed in testing. Saying it was determined to be starch was a lie. Everyone that followed the case knows the sample was so small it was used up in the one test she conducted after the "too low" "too low" readings. from the machine.
If you wish to say that someone that wrote a book on the subject can be allowed to be confused on this issue, to be it. I don't but it and even less so after Randy said he had told her.