Unfortunately there's been another officer involved shooting in St. Louis and now I'm seeing a lot of questions about why the officer didn't "just shoot him in the leg?" So it seemed to me that this would be a good time to write a quick post about combat effective shooting.
A lot of people who don't know much about guns wrongly assume that bullets are magic and kill on contact. Many, many people survive being shot multiple times by a handgun. There are stories of people who resisted arrest taking over five shots from a .45 (one of the larger, if slower, handgun rounds traditionally known for its stopping power!) and continuing to fight! Because of this, when people are trained to use a handgun defensively they are often taught about combat effective shooting.