Tasers (made by Taser International) are being by law enforcement used all up and down Asia. The attitude toward stun guns there is very lax compared with here in the U.S., where the folks at Amnesty International have their panties all in a knot because people are getting killed by these weapons. Why they're dying is unknown, but each story I've read about "accidental" deaths seems to suggest Taser misuse.
Anyway, buy your citizens Taser <a href="http://www.taser.com/self_defense/index.htm">here</a>. They're fully legal in Calif., and have restrictions in a handful of other states. I'm not sure about mailing overseas, but the company says more countries are approving Tasers. They've been OKed for use on passenger flights in Korea.