[Code of Federal Regulations] [Title 22, Volume 1] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 22CFR51.6] [Page 243] TITLE 22--FOREIGN RELATIONS CHAPTER I--DEPARTMENT OF STATE PART 51_PASSPORTS--Table of Contents Subpart A_General Sec. 51.6 Damaged, mutilated or altered passport. Any passport which has been materially changed in physical appearance or composition, or contains a damaged, defective or otherwise nonfunctioning electronic chip, or which includes unauthorized changes, obliterations, entries or photographs, or has observable wear and tear that renders it unfit for further use as a travel document may be invalidated. [70 FR 61555, Oct. 25, 2005]