Italy's top criminal court has blamed prosecutors for presenting a flawed and hastily constructed case against Amanda Knox and her former Italian boyfriend.

It reveals the court threw out their convictions for the 2007 murder of her British roommate in part because there was no proof they were at the crime scene.

The Court of Cassation issued its formal written explanation, as required by Italian law, for its March ruling vindicating the pair once accused of murdering Meredith Kercher, in the apartment in Italy.

The court wrote there was an 'absolute lack of biological traces' of Knox, or co-defendant Raffaele Sollecito in the room or on the victim's body.

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Italy's top criminal court has blamed prosecutors for presenting a flawed and hastily constructed case against Amanda Knox (pictured) and her former Italian boyfriend

The Court of Cassation issued its formal written explanation, as required by Italian law, for its March ruling vindicating the pair once accused of murdering Meredith Kercher, (pictured) in the apartment in Italy

The report goes on to slam the quality of the prosecution's case, citing 'blameworthy omissions of investigative activity.'

Media clamor also was a factor in what was ultimately a flawed case, the high court concluded.

'The international spotlight on the case in fact resulted in the investigation undergoing a sudden acceleration, that, in the frantic search for one or more guilty parties to consign to international public opinion, certainly didn't help the search for substantial truth,' the judges wrote.

The high court in March declared that Knox, now 28, and Sollecito, now 31, didn't murder the 21-year-old Kercher, a stronger exoneration than merely finding there was insufficient evidence to convict.

Had the Cassation Court upheld the 2014 appeals court convictions of the pair, Knox would have faced 28 years in an Italian prison, assuming she would have been extradited from the United States, while Sollecito had faced 25 years.

They had always proclaimed their innocence. A man from Ivory Coast, Rudy Hermann Guede, was convicted in separate proceedings and is serving a 16-year sentence.

The Cassation panel of five judges essentially concluded that while there were indications Guede could have had accomplices, nothing in the prosecutors' case proved that either Knox or Sollecito were involved in the murder.

It also wrote that the lower court ignored expert testimony that 'clearly demonstrated possible contamination' of evidence and misinterpreted findings about the knife allegedly used to slit Kercher's throat, in what prosecutors had described as a sexual assault.

On more than one of the 52 pages of explanation, the judges agreed with the defendants' contentions that the convictions were a 'violation of the principle of a reasonable doubt.'

Knox and her Sollecito were first convicted by a Perugia court in 2009, then acquitted after a first appeals court trial. They were convicted again in 2014, after a separate Cassation Court panel overturned those acquittals and ordered the Florence appeals.

While the flip-flop verdicts and appeals ran their course, Knox became a cause celebre in the United States, where many saw her as an innocent victim of a miscarriage of justice and sloppy investigative methods.