Diplomats say Iran insisted on the compromise as a condition for any probe of Parchin.

Deputy IAEA Director General Tero Varjoranta said that there have been over 40 instances of letting a country being inspected use their own nationals to do their own sampling and that the process is only a small part of a rigid regimen established by the agency to make sure there is no cheating.

He said the criteria at Parchin included: invasive monitoring by video and still cameras while the sampling took place; GPS tracking of the sampling process; IAEA agreement on where the samples were to be taken; review by unspecified peers of the inspection process; risk assessment and strict observance to make sure that procedures were followed step by step.

“We feel fully confident that the process and the result so far are fully in line with our safeguards practices,” he said, standing next to Amano at a Vienna news conference.