Milan, June 16 (LaPresse) – The DNA found under Chiara Poggi’s nails may have undergone "contamination," the "effect" of which on the genetic "profiles" would be "unpredictable." This is what prosecutors' forensic genetics experts Carlo Previderè and Pierangela Grignani wrote in a report entered into evidence for the evidentiary hearing set to begin Tuesday in the reopened investigation into Andrea Sempio over the murder of the 26-year-old woman, killed in Garlasco on August 13, 2007. They consider this one of the “important clarifications” regarding the “identified samples” taken from the fifth finger of the victim’s right hand, and the first and fourth fingers of her left hand — samples which the defense of Alberto Stasi attributes to 37-year-old Andrea Sempio, a friend of Marco Poggi. In particular, one of the five Y-chromosome haplotypes — indicating paternal lineage — was considered “perfectly overlapping” with a sample obtained from Sempio through a coffee cup, a spoon, and a water bottle taken by private investigators from the SKP agency. Previderè and Grignani based their conclusions on 37 screenshots of "electropherograms" (graphs used to identify DNA fragments) originally generated in 2014 in Genoa by Professor Francesco De Stefano, court expert in the second trial that sentenced Alberto Stasi to 16 years in prison. The prosecutors’ consultants (Napoleone, Civardi, De Stefano, Rizza) say that the traces identified in the “second round” of analysis (the first and third yielded different results) can be used for “comparisons,” but they also point out that the “lack of replication of profiles” from the nail samples (due to the limited quantity of biological material) opens the door to “artifactual amplification phenomena,” anomalies, or “minor contaminations,” as stated in the 61-page report.
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