There are some interesting evidence points for comparison in the case of Noara Jackson's murder of her mother and the murder of Meredith Kercher. The main points for the conviction of Noara were: no explanation for what she was doing at the time of the murder, staged break in. The main points for the defense were: no DNA in her mother's bedroom, no blood, unidentified DNA on the sheets, no bloody clothes.
The absence of DNA or blood from Noara in her mother's bedroom, even though she had a cut on her hand, was used to argue that she couldn't have committed the crime - very similar to the case of Knox and Sollecito. The break in was considered staged because of the unusual location of a broken window. Even though people had walked into the home - past the area of the staged break in - it was still viewed as a staged break in since it was the location of the broken window, and not the broken glass, that mattered.
18 year old Noara used soft drugs. She had no criminal record. She had a sense of entitlement. She covered her mother's face after the knife attack. Her DNA was not in her mother's bedroom even though she lived in the house. There were no bloody clothes or footprints pointing to Noara as the murderer. Noara's biggest problems were her absence of alibi and the staged break in. The cut on her hand was circumstantially connected with the night of the murder, but the absence of blood in her mother's bedroom gave doubt.
This has many similarities to the murder of Meredith Kercher - with circumstantial evidence being the strongest link between the murder and the three convicted prisoners. Regarding the staged break in at the cottage, not only is the location of the break in suspicious but the location of the broken glass on the floor also leaves many questions.
http://www.cbsnews.com/stories/2010/04/10/48hours/main6383885.shtml