The families of Amanda Knox and her boyfriend, Raffaele Sollecito, wept in court Saturday as a judge ruled that controversial DNA evidence will need an independent review before it can be used to convict the pair. Knox and Sollecito are accused of working with a third man, the already-convicted Rudy Guede, to kill Knox's British roommate. Knox was originally convicted based on DNA evidence found on the knife used to cut the roommate's throat, and Sollecito on evidence found on one of the roommate's bra clasps. But the judge ruled that the two items could have been contaminated separately from the crime. The ruling paves the way for an additional nine months of hearings, during which defense lawyers will try to get several new witnesses, including a Mafia informer and a convicted child murderer, to testify that their associates committed the murder.