Hampikian was asked to research how detectives collected and analyzed the DNA. What he found was "disturbing" because he said the evidence pointed to someone else and detectives had a "gut" feeling about Knox and her boyfriend.
While looking into the case, Hampikian noticed the amount of DNA authorities found on a knife was so low it could have easily gotten there through contamination.
And that occurs when someone touches an item and could transfer the DNA while touching something else. That's why annalist usually require a higher content of DNA on something before they make concrete findings.
Hampikian proved his research by doing a simple test with students and secretaries at BSU. The students wore gloves and collected soda cans that the staff had been drinking. They but them in an evidence bag and using the same gloves opened up new knifes and began testing them. Normally investigators are supposed to change their gloves every time they touch a new piece of evidence. Using the standard normal used in the US none of the DNA showed up. But when they looked for smaller samples like investigators in Italy did. They noticed the secretaries DNA showed up on the knifes.
Other experts began signing on to the findings. Even though Hampikian's work was never allowed during any of the trials. The appeals judge ordered to independent experts from Rome to study it and they came up with the same results as Hampikian.
Even though the retrial is going forward Knox will not be going back to Italy for it. Even if she is found guilty it's unlikely that the US would allow her to be extradited back.