Perhaps one way to convince skeptics that the intrusive inspection regime included in the negotiated Iran nuclear agreement will actually work - would be to show that if it had been in place decades ago when Israel was secretly developing its own nuclear weapons and missile technology, the inspections would have detected the then Israeli nuclear weapons development program.
Everyone knows that Israel has up to 200 atomic or nuclear bombs that it secretly developed years ago. U.S. intelligence agencies know today where the Israeli weapons labs and testing facilities are located and where the Israeli submarines and other launching sites are located.
The Obama Administration should prove to its Congressional and foreign skeptics that the Iran agreement's inspection processes will be adequate by showing that comparable inspection mechanisms in place years ago would have discovered the early Israeli nuclear weapons development.
Israel does not share the details of its own nuclear weapons program with U.S. intelligence agencies - but U.S. intelligence agencies nevertheless know essentially all of the important details of the Israeli nuclear weapons program. Under the recently negotiated agreement with Iran, in part relying on the agreement's intrusive inspections regime and in part relying on other sources and methods, U.S. intelligence agencies will be able to monitor the Iranian program - and be able to detect cheating by Iran.
What the Iranian negotiators should have done - and perhaps will insist on next time if this agreement is voted down by Congress and there is a future negotiation of a replacement agreement with Iran (doubtful that that could happen - but that is the naive, wishful thinking or deceptive public reasoning of people like New York Senator Schumer) - is that Iran will agree to an extensive and intrusive inspection regime - BUT ONLY IF AN IDENTICAL INSPECTION REGIME OF ISRAEL's NUCLEAR WEAPONS PROGRAM by the international community is agreed and implemented.