There was a study that was conducted in Chicago on pigs, which was quite famous, and one of the people investigating that was a police officer, who was conducting some of those investigations. One of the points they made was that they could not get ethical clearance to do the testing on humans.
One of the points that I think I've always noticed is that nowhere in any of the testing--even where they tested on police officers--do they ever test it by shooting someone directly into the front. They always do the testing.... It seems to me, whenever I've watched it, and I could be corrected--I may be wrong--that I've only ever seen it shot into the back. Typically, the taser is discharged into a police officer's back, and he's usually young and healthy, and they've got a couple of guys standing beside him ready to catch him. In any event, the point is that they're not usually shot into the chest.