Turning to the bra clasp, the reviewers affirmed Sollecito's profile (17 alleles) on the hooks in a Sollecito/Kercher mix, but suggested that its collection during the second pass meant contamination could not be ruled out as an explanation. (During this second pass two items with Guede profiles, the purse and the sweatshirt, were also collected.) They did not explain how the passage of time in a sealed crime scene would cause the clasp to become contaminated in this way, nor did they identify a source of so much Sollecito DNA, his only other genetic trace in the house being on a cigarette butt in the kitchen, mixed with Knox's (this was removed on November 3). By way of explanation reviewer Conti only said "anything is possible." In other words, the Hellmann court held contamination to be a probable explanation for the trace on the clasp without identifying a likely route or even source. The Supreme Court, in overturning Hellmann's ruling, was especially harsh regarding the lack of logic on this point, calling it completely unmoored from scientific reasoning.