In Sollecito’s apartment, an extremely clean kitchen knife different from the other ones supplied in the house that he occupied on Corso Garibaldi was found; on the handle of this knife, in the raised portion of the handle where the blade begins, a biological trace (trace A) attributable to Knox was found: the place where the trace was found suggested that the knife had not been used in a horizontal direction, but at a certain angle, suggesting a slipping action of a hand seizing the knife to strike rather than to cut.