Overview
- Judge-appointed expert Denise Albani reports Y‑chromosome correspondence on two fingernails that statistically favors Andrea Sempio’s paternal line, confirming prosecutors’ 2024 consultancy.
- Biostatistical support for the right-hand trace is assessed as moderately strong to strong (likelihood ratios roughly 476–2,153), while a left-hand trace yields moderate support (about 17–51).
- One additional nail shows a male profile that matches neither Sempio nor eight other tested men, including Alberto Stasi, indicating an unidentified contributor.
- Albani criticizes the 2014 analyses for not quantifying DNA, using different eluate volumes, and providing unusable tabulations, saying these choices prevented a consolidated result.
- The perizia stresses Y‑STR limits and provenance uncertainty—no determination of how or when DNA was deposited—and notes new checks found no trace linking Stasi to the scene as prosecutors move toward seeking a trial for Sempio.