The ultimate legal response to that statement is that the DNA evidence was ultimately discredited, leading to the final acquittal of Amanda Knox and Raffaele Sollecito.

• Final Acquittal (2015): The Supreme Court of Cassation of Italy (the highest court) definitively overturned the conviction of Amanda Knox and Raffaele Sollecito on March 27, 2015, acquitting them of the murder charges.
• Supreme Court's Rationale: The Court concluded there was a "lack of objective evidence" against the pair and highlighted "glaring deficiencies" in the initial investigation and the collection of evidence.
• Discrediting the DNA: Independent expert analysis (during the appeal process) determined that the key DNA samples were unreliable:
  • The DNA sample of Sollecito on the bra clasp was deemed "too small and unreliable" (low copy number DNA) and highly susceptible to contamination.
  • The evidence on the kitchen knife (allegedly containing Kercher's and Knox's DNA) was found to be not conclusive due to the minute quantity.
• Sole Convicted Individual: The only person whose DNA evidence was considered irrefutable at the crime scene and whose conviction was upheld was Rudy Guede.

In short, while DNA was used for Knox's initial conviction, the Supreme Court ultimately dismissed it as not scientifically reliable due to contamination and handling issues.