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an idea for tactile feedback if used in low power version, well below "pain" level:

http://en.wikipedia.org/wiki/Active_Denial_System#Effects

Developed by CPI here in Palo Alto.

I thought you were going to say an electric shock. Although an electric shock would also use a lot of power and probably be a terrible idea just like microwave heating of the skin, at least the shock would provide fast feedback

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