IRAN'S REFUSAL FOR ADVANCED NUCLEAR INSPECTIONS

"...(The) International Atomic Energy Association (IAEA) verification under the Additional Protocol... (is) a voluntary but advanced nuclear safeguards standard introduced in the mid-1990s. ... if Iran wants to put an end to repeated Western calls for it to prove that its nuclear program is exclusively peaceful... the Additional Protocol is the solution. The one and only proof of a peaceful program that the non-proliferation community cannot contest are the assurances that can result from the IAEA's Protocol investigations: "no undeclared nuclear activities or material".
http://www.atimes.com/atimes/Middle_East/NH08Ak01.html