Knox, from Seattle, is on trial, along with Italian ex-boyfriend Raffaele Sollecito, for allegedly killing Meredith Kercher, Knox's British roommate in the central Italian town of Perugia. Knox and Sollecito both deny wrongdoing. They are charged with murder and sexual violence in what prosecutors assert began as a sex game.
Knox's mother, Edda Mellas, testified Friday and was in court as a spectator on Saturday.
Speaking from outside the courthouse, Mellas told Early Show Saturday Edition co-anchor Chris Wragge, "One of the big things you don't hear a lot about is the fact that, at the actual crime scene, there's no, no physical evidence of Amanda - not a hair, not a fingerprint ... nothing."
She continued, "The DNA (prosecutors say was found at the scene) is so insignificant - it's this tiny spot, it's not blood, it could well have come from ... who knows where."
48 Hours Mystery looked at the case in a recent episode.
PREVIOUSLY ON CRIMESIDER
June 19, 2009 - Knox's Mom Says Daughter, Victim Got Along
June 15, 2009 - "Always A Crescendo:" Amanda Knox Talks About Murder Investigation On Stand
June 12, 2009 - Knox's Alibi: Sex, Drugs And Sleep
June 8, 2009 - Amanda Knox Set To Testify In Italian Murder Trial
June 5, 2009 - Victim's Family To Testify In Amanda Knox In Italian Murder Trial