Prosecutors have lost an appeal against killer driver Christopher Dillon Joannidis's sentence. (Joel Carrett/AAP PHOTOS) The son of a woman killed in a horrific crash has declared the justice system "absolutely broken" after prosecutors lost their appeal of the driver's three-year prison term. Christopher Joannidis ignored a police warning about the dangerous roads in Strathmerton, in Victoria's north, disregarded signs and crossed three sets of rumble strips before killing five people and a dog.