CFR > Title 22 - Foreign Relations > CHAPTER I—DEPARTMENT OF STATE > SUBCHAPTER E—VISAS (parts 40 to 47) > PART 40—REGULATIONS PERTAINING TO BOTH NONIMMIGRANTS AND IMMIGRANTS UNDER THE IMMIGRATION AND NATIONALITY ACT, AS AMENDED > SUBPART D—Security and Related Grounds (§40.31 to §40.36-40.39)