The average LEO is not a sharp shooter. When you go through academy training, you're taught too am for the largest target. There's a better chance of hitting someone in the chest than the leg or am when he's moving. Unfortunately, death is generally a consequence.
When I went through training, several people in the class volunteered to be tased. (I got out of it because at that time it would have taken an extra day too remove all my body jewelry, and metal conducts.) Anyhow, no one was down for long, not men or women, big or small. It's a momentary stun. Most people are dropped, but will get right back up again. It's a pretty ineffective weapon.