mtfester@netMAPSONscape.net wrote:

> As always, make certain to always enter the US on your US passport
> afterwards; otherwise, this can be considered a renunciation of choice.

You mean one has the choice of using either passport but isn't allowed 
to choose which one to use when entering the US? That seems very odd to me.

I would have thought that the best way to make sure the Japanese 
authorities did not have grounds to revoke the Japanese nationality of 
someone who continues to enjoy dual citizenship rights while not in 
Japan would be not to bring any evidence of citizenship of Japan into 
the country.

What would be wrong with leaving one's American passport in the US, so 
as not to run the risk of being caught in possession of it by the 
Japanese customs?

John