The Iran nuclear deal, negotiated during the Obama administration, included deep verification mechanisms with inspectors on the ground covering Iran's nuclear infrastructure.

“The Joint Comprehensive Plan of Action (JCPOA) established what many experts called the most robust and intrusive nuclear verification regime ever negotiated. The International Atomic Energy Agency (IAEA) was tasked with monitoring, and its inspectors on the ground verified Iran's compliance. The deal included continuous surveillance of uranium mines and centrifuge production facilities, the use of advanced monitoring technology, and granted the IAEA expanded access to sites under an 'Additional Protocol.' While not without some limitations, the framework provided comprehensive coverage of Iran's declared nuclear infrastructure. Context: The JCPOA's verification measures were designed to ensure that Iran's nuclear program remained exclusively peaceful. These measures significantly increased the IAEA's access and monitoring capabilities compared to the previous arrangements.”