Forensic scientist threatens to sue after her work on Meredith Kercher murder is attacked in Amanda Knox appeal report

Amanda Knox's appeal against her conviction for the murder of British student Meredith Kercher in Italy faces a fresh challenge. A prominent forensic scientist, whose DNA evidence helped to convict the US student and her former boyfriend, has vowed to overturn the findings of an independent report that says much of her work in the case was unreliable.