ROME (AP) – Italy’s top criminal court says it threw out murder convictions against Amanda Knox and her former Italian boyfriend because there was absolutely no proof they were at the scene of her British roommate’s slaying.

The Court of Cassation on Monday issued its formal written explanation, as required by Italian law, for its March ruling vindicating the pair once and for all in the legal battle over the 2007 murder of Meredith Kercher in Perugia, Italy.

Amanda Knox is escorted to her appeal hearing at Perugia’s Court of Appeal on September 29, 2011 in Perugia, Italy. Amanda Knox and Raffaele Sollecito are awaiting the verdict of their appeal that could see their conviction for the murder of Meredith Kercher overturned. American student Amanda Knox and her Italian ex-boyfriend Raffaele Sollecito, who were convicted in 2009 of killing their British roommate Meredith Kercher in Perugia, Italy in 2007, have served nearly four years in jail after being sentenced to 26 and 25 years respectively. 

The court wrote there was an “absolute lack of biological traces” of Knox, an American, or co-defendant Raffaele Sollecitio in the room or on the body of the victim. Slamming the quality of the prosecution’s case, the court faulted the investigators for “blameworthy omissions of investigative activity.”