22 C.F.R. § 41.11 Entitlement to nonimmigrant status.
(a) Presumption of immigrant status and burden of proof. An applicant for a nonimmigrant visa, other than an alien applying for a visa under INA 101(a)(15) (H)(i) or (L), shall be presumed to be an immigrant until the consular officer is satisfied that the alien is entitled to a nonimmigrant status described in INA 101(a)(15) or otherwise established by law or treaty. The burden of proof is upon the applicant to establish entitlement for nonimmigrant status and the type of nonimmigrant visa for which application is made.
(b) Aliens unable to establish nonimmigrant status. (1) A nonimmigrant visa shall not be issued to an alien who has failed to overcome the presumption of immigrant status established by INA 214(b).
(2) In a borderline case in which an alien appears to be otherwise entitled to receive a visa under INA 101(a)(15)(B) or (F) but the consular officer concludes that the maintenance of the alien's status or the departure of the alien from the United States as required is not fully assured, a visa may nevertheless be issued upon the posting of a bond with the Secretary of Homeland Security under terms and conditions prescribed by the consular officer.