Nightline Podcast - June 29th, 2011

In tonight's podcast, a look at the appeal trial for American exchange student Amanda Knox, who four years ago became entangled in the murder of her roomate in Italy. New investigations found that some of the DNA evidence used to convict her was unreliable. Then, we turn to the depths of the Caribbean waters where racers zoom through a marked racecourse on underwater scooters. Sans oxygen masks, it's perhaps the most dangerous sport around. Lastly, doctors weigh in on the debate over fashion magazine's overuse of photoshop to slim down even the skinniest of models.

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