http://www.alternet.org/blogs/rights/108404/Metro's initial approach to Taser instruction can be summed up like this: Almost everything the police knew about Tasers, and taught officers about Tasers, they learned from Taser.
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Today, Taser warns that the device can cause burns. Moreover, the company acknowledges these burns can become infected. It warns that people who are shocked by Tasers can suffer bone fractures, hernias, ruptures and dislocations. Today, Taser suggests students be Tasered while lying facedown on the floor, eliminating falling hazards and stray Taser probes to the eye.
And yet, police use these things indiscriminately.
And nobody seems to think there's anything wrong with the police inflicting horrible pain on people on the thinnest of pretexts. As long as there's no permanent damage, there's no harm in it. Heck, even if there is permanent damage, it's the victim's fault for failing to be properly cooperative --- or agreeing to do it as part of their job.
You can see why waterboarding is now considered perfectly acceptable. The authorities only use it when they believe they need to (and ok, sometimes just because they're in a bad mood) and it doesn't leave any permanent damage either. No harm no foul. What's the problem?