This is just like the Nazis. The (Nazi-friendly) Red Cross visited one of the Nazi death camps. Prior to the visit, the Nazis had sanitized the place, fed the inmates, and made it look like it was simply a labor camp. This is what Iran is doing. They are running multiple enrichment facilities. One is for show, to pretend they are having problems and delays, while the hidden one(s) are the real deal. And if you're not sure they are doing this, can you and I afford to take a chance???
I don't see how ANY inspection program can stop a country that wants to make a nuke from doing so. Actually, I think that as a sovereign nation they have every right to make a nuke. And we have a sovereign right to stop them.