It was essentially what she'd expected. Goyle was not a match for the DNA recovered from Hannah. Quirrell's matched not only that taken from Hannah's rape kit, but also her own. The likelihood of it being anyone else was one in several billion. It was Quirrell, no question. She had known that already, of course. When he'd confessed to the murders he knew details only the killer would know - such as the precise location of Sarah's body near Knockturn Alley - and she had no reason to doubt his confessions, but it helped to see forensic science confirm it.