"In the first trial, prosecutors maintained that Knox's DNA was found on the knife's handle and Kercher's DNA was found on the blade. They also say Sollecito's DNA was found on the clasp of Kercher's bra, mixed with the victim's."
This was the sole issue upon which the prosecution rested its case, which it why it NEVER would have seen the light of day in an American court, and probably not in a UK, Canadian, or Australian court.
JT---This statement is just not true! There are cases every day that are prosecuted in the American court systems that have as little or less evidence. Sometimes people are convicted on circumstantial evidence. I know this first hand, as I work as a court reporter in a court. You'd be shocked at how little evidence it takes for a crime to be prosecuted.