But the JCPOA had some big issues with it. It was time bound- that is it only delayed Iran's program ( https://en.wikipedia.org/wiki/Iran_nuclear_deal ) and Iran got sanctions relief in return that allowed it to fund its proxies and pursue other activities not constrained by the agreement (such as its ballistic missile program, drones etc.).
Iran also restricted IAEA access to military sites while the agreement was in effect.
https://isis-online.org/isis-reports/revealed-emptying-of-th...
That's a fascinating insight into what friends of Bibi can do with photoshopped text on long range photos.
Doesn't include any 256 channel multi spectral radiometric data from ground level crystal packs though ... I guess they didn't show much of interest in the gamma spectrum.