25.703-3Comprehensive Iran Sanctions, Accountability, and Divestment Act of 2010, section 106.
(a) The head of an Executive agency may not enter into or extend a contract for the procurement of goods or services with a person that exports certain sensitive technology to Iran, as determined by the President and listed on the Excluded Parties List System via https://www.acquisition.gov.
(b) Each offeror must represent that it does not export any sensitive technology to the government of Iran or any entities or individuals owned or controlled by, or acting on behalf or at the direction of, the government of Iran.
(c)Exception for trade agreements. The representation requirement of paragraph (b) of this subsection does not apply with respect to the procurement of eligible products, as defined in section 308(4) of the Trade Agreements Act of 1974 (19 U.S.C. 2518(4)), of any foreign country or instrumentality designated under section 301(b) of that Act (19 U.S.C. 2511(b)) (see subpart 25.4).