I'm not entirely against the idea of Tasers on principle, but they should be treated as lethal force, the same as drawing a gun. If you wouldn't draw and fire your gun on someone to ensure compliance, a Taser shouldn't be drawn and fired either. It's not legal to shoot unarmed suspects, and again that restriction should apply to Tasing.
In the same vein, the things should have a counter (whether hidden or viewable from the exterior) that keeps track of how many times it has been discharged, similar to police accounting for spent ammunition. When police officers discharge their weapons (and especially when a suspect dies), the investigation teams come out - this should be the same procedure for Tasers.
Of course, that's all on adults. Tasering children should just be considered in the same league as pulling out the billy club - you just don't do it. It speaks volumes that for thousands of years, children could be disciplined without electrical shocks, and now suddenly they're the front-line option. I think that speaks to incompetence and laziness on the part of law enforcement if they can't even deal with a child without pulling out the weapon.
The Government scientists were also asked to test whether the weapons could cause a miscarriage if used on a pregnant woman. While not saying whether police would be allowed to Taser an expectant mother, the Home Office said the DSAC committee had "specifically asked" for computer simulations to be carried out to analyse the effect on "a pregnant female".
That's even worse. That's quite equivalent to pulling out the billy club on a pregnant woman. All she has to do is fall the wrong way or seize up and bad things happen.
Testing Tasers on pigs and physically fit police officers in their twenties and thirties is not representative of the rest of the population. They're becoming a tool of laziness and indicative of the lack of training police used to receive in defusing situations or ensuring compliance with psychology and backup. The current situation of unbridled use is so unsustainable, but it will probably take the Tasering of some politician or politician's family member for it to stop.