The Obama administration assures Americans that the Iran deal grants access within 24 days to undeclared but suspected Iranian nuclear sites. But that’s hardly how a recalcitrant Iran is likely to interpret the deal. A close examination of the Joint Comprehensive Plan of Action released by the Obama administration reveals that its terms permit Iran to hold inspectors at bay for months, likely three or more.

Paragraphs 74 to 78 govern the International Atomic Energy Agency’s access to suspect sites. First, the IAEA tells Iran...