Lt. Col. (res.) Dr. Raphael Ofek
Samples recently collected by International Atomic Energy Agency (IAEA) inspectors at two Iranian sites showed traces of radioactivity. Tehran had not reported any nuclear activity at these sites and denied IAEA inspectors access to them until just a few months ago. The findings suggest that Iran, in violation of the JCPOA nuclear agreement it signed in July 2015, has continued to conduct activities related to nuclear military development.
https://besacenter.org/perspectives-papers/iran-nuclear-weapons-program/