Why Amanda Knox is completely innocent and the Italian justice system is utterly insane

Most people know that Amanda Knox - "Foxy Knoxy" - is the pretty American student who was arrested and found guilty of the stabbing death of her British roommate in Italy, during a "sex game" gone wrong, when the pair were on study-abroad programs nearly a decade ago.

Unfortunately, a far smaller number of people know Knox was probably completely innocent of the crime; that another man was successfully convicted of the murder; and that NONE of the evidence - blood, DNA, or witnesses - ever really pointed to Knox.

Here's a primer on the Knox case, and the miscarriage of justice at the heart of it.

Knox, now 27, was able to the US in 2011 after four years in jail because an Italian appeals court overturned her conviction. Italy's highest court, however, reversed her acquittal after she'd already left Italy.

She was retried and found guilty though she never went back for the trial. Italy's highest court is set to weigh in on the case again on Friday when it will decide whether to affirm her second conviction.

Italy will likely demand her extradition if her conviction is affirmed, though as CNN points out, US officials could very well say no.

Knox's retrial - and her second conviction - would never happen in a US court, where the Constitution forbids "double jeopardy."

The frustration for followers of the case - and Knox herself, of course - is that some people have a vague sense that she was Meredith Kercher's killer, and that somehow - on a technicality! - she wriggled free.

It's important to understand that when Knox went to Perugia to study, she was just 20 years old. Like a lot of kids in college, she experimented with marijuana, booze, and boys. She didn't feel the need to apologize or hide the fact.

This part of the Knox story - that she was a pretty, unapologetic party girl - seems to have worked against her from the start, even though it has nothing to do with the case.

Kercher's killer is actually Rudy Guede, an itinerant African immigrant.

Guede found Kercher's body in the house she shared with Knox (even though he didn't live there). His fingerprints were found at the scene. He admitted being there prior to the killing (and using the toilet). And one of his palm prints was found in a blood stain underneath Kercher's body.

He then fled town, and had to be extradited back to Italy from Germany to stand trial. He's serving 16 years.

In the excellent book on the case, "The Fatal Gift of Beauty; The Trials of Amanda Knox," author Nina Burleigh describes Guede's history with the law: He was previously arrested for housebreaking, and on one occasion stole a knife (Kercher was stabbed).

The book is sourced at a level of detail that's almost excruciating, and this is the most baffling question it raises: Why was Knox prosecuted in the first place?

The answer is that the Italian prosecutor in charge of the case was an obsessed weirdo who was convicted of corruption.

Giuliano Mignini had previously prosecuted the "Monster of Florence" serial killer case and became convinced it was a masonic conspiracy. His case came to nothing. Mignini was later convicted of illegally tapping the phones of various police and reporters connected to the Florence case and was given a 16-month suspended sentence.

Somehow, he was allowed to be in charge of the Kercher murder, and he screwed that up too.

The alleged ritualistic sex game, for instance, turned out to be manufactured from whole cloth.

There was no DNA evidence indicating Knox killed Kercher:

• The forensic evidence that did exist was mishandled by Italian authorities prior to trial. (Kercher's bra clasp was left on the floor of the crime scene for six weeks before blood evidence was found on it.)
• A bloody knife print didn't match the knife police had in custody, so Mignini's team had to create a theory involving two knives, Burleigh reports.
• One of Mignini's witnesses against Knox was Antonio Curalato, a homeless anarchist who slept on a bench near Knox's house. He testified on who was near the house that night, and he also remembered seeing a party bus on the night of the killing. Burleigh's book shows that that bus was not scheduled to run on the night of Kercher's death.
• Curalato turned out to be a serial witness and heroin addict whom the police had persuaded to testify in two other murder cases.

It's not just that Knox was falsely accused. It's that her entire life was ruined in the process, in the most vindictive and sexist way possible. At one point, Burleigh reveals, a police official posing as a doctor informed Knox she had HIV, and asked her to name all her previous sexual partners so they could be alerted to the risk. She did so, and only found out later that it was a trick. The Italian cops just wanted to know about her sex life. (Her boyfriend at the time, Raffaele Sollecito, was also eventually acquitted of aiding in Kercher's murder and convicted again.)

Knox was guilty of two things:

She did falsely accuse Patrick Lumumba, a bar owner, of being involved in the crime. She was convicted of that libel and sentenced to time served (three of the four years she spent behind bars).

She was also guilty of being young and naive. Burleigh's book paints a picture anyone who has ever been 20 years old and away from home for the first time will recognize: a young woman enjoying herself, taking risks, being a bit of a jerk by all accounts, and not really understanding - or caring - how the perceptions of older adults might play against her.

She was convicted in part because the Lumumba accusation made her look guilty; because she failed to act sad enough; and because the Italian authorities and jury had sexist views of her behavior.

Few Americans regard the Knox case as a feminist issue, or Knox as a victim of discrimination. They should reconsider.

She essentially served four years in prison for having a sex life.