An Italian court on Wednesday opened a retrial of the slander conviction against US citizen Amanda Knox, who was famously imprisoned and later acquitted in the murder of her roommate in Italy almost 17 years ago. In 2007, Knox and her then-boyfriend were arrested a few days after the body of her roommate Meredith Kercher, a 21-year-old British exchange student, was found in their flat in the central Italian town of Perugia. After her arrest, Knox, then a 20-year-old student, was given a three-year prison sentence after she wrongly accused a bar owner of having killed Kercher. Knox was initiall…