Heh, yeah. I've heard those stories too. I don't know. I've never been in that situation (well, in Japan I haven't… <_<), so I can't speak to the authenticity of them -- but I think that being informed about the law is the best thing you can do to protect yourself when entering that situation. And, you seem to be relatively informed, so I'd put your odds of being wrongfully arrested are lower than if you weren't. (IANAL)