I think you are in a corner. If your claim is that Meredith's DNA was found in the previous run, either this was contaminated, or it was a piece of evidence.
If it was contaminated, you may only imply there was evidence of contamination, which lead to the decision to suppress it, and contamination on a single run could only be detected through negative controls.
But if negative controls showed contamination in 365, how does it happen that they turned out all negatives in the following run, 365bis, under the eyes of Potenza?
And Novelli analyzed also the 105 tests performed over the previous 6 days, during which no trace of Meredith was found. It's strange that the defend didn't make any request for raw data in their reasons for appeal, and it's also strange that she Hellmann ordered the rinnovazione dibattimentale they still didn't come to the laboratory to access the files, as Novelli did.