had to go back. prescription for cheating. they read our x-rays, but a cnn investigation reveals a disturbing question over the certification of many radiologists. isn t it cheating? revealing investigations, fascinating characters, stories with impact. this is cnn presents ith tonight s host randi kaye and drew griffin. tonight, hard hitting investigations involving racism and cheating and injustice. we begin with a murder in mississippi. a brutal killing fueled by race and rage. we broke the shocking story here on cnn of a young, white teenager accused of killing a black man just because of the color of his skin. over our four-month investigation, we found even more disturbing details uncovering how the teenager and some of his friends had a history of violent and racist incidents and raising questions whether authorities turned a blind eye. i ve been following this story from the very beginning. june 26th in mississippi would bring temperatures and humidity into