would present witnesses, one who says they saw the couple near the home the night of the murder. two others would come forward saying they heard a scream, one of them also hearing footsteps running in different directions. but magnini now would also present scientific evidence, he says, proved amanda and raffaele's guilt. two dna samples. raffaele's skin cells on meredith's bra clasp collected 46 days after police first showed up at the murder, and what one expert called an inclusive sample of what could have been meredith's dna found on a knife collected at raffaele's apartment. on the handle, amanda's dna. according to the prosecutor because the victim had never been to raffaele's apartment, the knife must be the murder victim. but tests for blood on the knife turned up negative.