"In 2005, Iran was held to be non-compliant with the NPT Safeguards agreement; which is Article XII.C of the IAEA Statute (separate from the NPT), as it had not disclosed it's civilian uranium enrichment program[22]. It has not been found to be in non-compliance with the NPT itself." - Wiki

...but then, of course, India never signed, and neither did...

which makes the NPT a rather weak and ineffective tool for maintaining peace. Besides that, a nation can opt out at any time. I wonder if the U.S. has halted all development of nuclear weapons? Maybe we should order an inspection.