CSI: Miami Season 3 Episode 3

A woman falls from the pavement and is hit by a speeding bus. She dies instantly. A hand-shaped bruise on her back convinces both Alexx and Horatio that she was murdered. Calleigh's father thinks that he may have killed someone while driving drunk. Horatio wants someone with no biases to work on the case and assigns the rookie Ryan it. He has just hired him because he is impressed by how clean Ryan's guns are.