'A local attorney advised that I take these misgivings to a blood-spatter expert, so an Internet search and a phone call led me to Iris Dalley, a retired crime scene investigator for the Oklahoma Bureau of Investigation. Today, Dalley is a crime scene consultant and serves as the president of the International Association of Blood Pattern Analysts.
She says that there is no way that a bullet would propel Hartley through the air and forward off his jet-ski. "The bullet won't make you airborne," she says. "A sudden stop of the jet-ski could. "Like if you are in a car wreck and you are not wearing a seat-belt, your body still has forward momentum whether your vehicle does or not," she says.'
More at link:
http://blogs.houstonpress.com/hairballs/2010/10/tiffany_young-hartley_a_csi_ex.php
I'm not a scientist, but that "flying over the jet ski" story always struck me as contrary to the laws of motion.