Given that the shooter has no way to control the exact placement of the taser barbs, then he can't make one hit center of the chest and one hit a leg.
Only partly true DNS. While you can't get bullseye accuracy with a Taser, you can (roughly) control the impact points and spread of the probes. The top probe fires in a straight line with the Taser's laser sight, but the bottom probe fires at a 20 degree downward angle from that.
Given that, controlling the distance to target controls the spread between the probes. If memory serves, Taser Int. recommends that the effective range be between 7 and 21 feet.
By rotating the Taser, you have some control on where the bottom probe strikes.
Obviously, in a real defensive situation, you most likely won't have the luxury of doing the math before you fire
, but the point is, it is possible.
If your peripheral nerve receptors (nerves controlling your extremity muscles) are being blocked by a chemical (drug), another manipulative reaction (tazer) will not work, unless the second reaction is stronger than the first.
I understand what you're saying Sheepdog, but it sounds like you're implying that a Taser gains compliance through pain. With the older stun guns, that was the case, but that's not so with a genuine Taser.
The secret to a Taser's effectiveness isn't the voltage; it's the frequency at which the shock is delivered. The frequency matches that of the nerves firing the voluntary muscles and overrides those nerves so that, in essence, your body is no longer your own. Pain or not, you have no control.
Still, there are those individuals that, through some mysterious process, break all the rules, but it's been my experience (and I have used both the M-26 and X-26 Taser to great effect more than once) that,
properly used, a Taser is effective the vast majority of times.
By the way, one way to tell if you have good probe contact is to listen. A properly deployed Taser with good solid contacts will be silent. If you hear that rapid "click click click", the probes haven't made good contact and it's time to go to plan B.