Originally Posted by
hailstorm
Is it really worth the risk, however small, of getting into really big trouble by trying to hide from the letter of the law? I'd advise to just take the passport wherever you go in a foreign country.
I suppose by that logic you would need always to carry an asteroid shield. Not having your gaijin card or passport won't get you into big trouble, and the risk is miniscule unless like Hailstorm your spend your evenings in Roppongi touting passerbys.