Irreversible. Wonder how that works? Really.

That's one of the American demands upon the NORKs.  We want denuclearization that is irreversible.   Just just how do we prevent the NORKs from deciding to scrap whatever deal they make and start up their nuclear program again?   Even if we insist on daily no knock inspection of their nuclear sites, they can just create new secret sites, keep 'em secret, and go merrily on enriching uranium, making plutonium, and building bombs.