In the Knox case, while the recent annulment and referral for retrial followed by a final re-conviction for calunnia has absorbed much interest, it is important to recall that the Italian authorities have not at all addressed one of the three key violations of the Convention found by the ECHR in Knox v. Italy: that is, the violation of Article 3 (procedural limb).
Perhaps the Italian authorities are hoping that the Committee of Ministers will somehow forget about this violation in the confusion resulting from Italy's audacious wrongful re-conviction of Knox based on ambiguous or contradictory evidence (a violation of Italian law CPP Article 530) and the rather large number (75) of pending ECHR cases against Italy under the supervision of the CoM.
In 2017, Italy passed a law, CP Article 613 bis*, making torture and inhuman or degrading treatment crimes punishable by imprisonment; if the crime is committed by a public official (for example, a police officer), the sentence if convicted is from 5 to 12 years, except if the victim dies as a result of the crime, the sentence is 30 years (unintentional death) or life (intentional death). Since the alleged police mistreatment of Knox occurred in 2007, this law cannot be lawfully applied.
Nevertheless, Italy remains under an international law obligation (under the Council of Europe - ECHR treaty) to conduct an independent and effective investigation of Knox's credible claim of mistreatment by the police. This investigation must be conducted even if the maximum time under the statute of limitation for any Italian law relevant to the type of mistreatment alleged has expired; see the ECHR case P.P. v. Italy 64066/19 paragraphs 54 - 55** and the Guide on Article 3 paragraphs 134 and 138***.
*
https://www.altalex.com/documents/codici-altalex/2014/10/30/codice-penale
**
https://hudoc.echr.coe.int/eng?i=001-241744
***
https://ks.echr.coe.int/documents/d/echr-ks/guide_art_3_eng