[Code of Federal Regulations] [Title 22, Volume 1] [Revised as of April 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 22CFR51.6] [Page 256] TITLE 22--FOREIGN RELATIONS CHAPTER I--DEPARTMENT OF STATE PART 51--PASSPORTS--Table of Contents Subpart A--General Sec. 51.6 Mutilation and alteration of passports. Any passport which has been materially changed in physical appearance or composition, or which includes unauthorized changes, obliterations, entries or photographs may be invalidated.