[Code of Federal Regulations] [Title 21, Volume 9] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR1311.60] [Page 146] TITLE 21-FOOD AND DRUGS CHAPTER II--DRUG ENFORCEMENT ADMINISTRATION, DEPARTMENT OF JUSTICE PART 1311_Digital Certificates--Table of Contents Subpart B_Obtaining and Using Digital Certificates for Electronic Orders Sec. 1311.60 Recordkeeping. (a) A supplier and purchaser must maintain records of CSOS electronic orders and any linked records for two years. Records may be maintained electronically. Records regarding controlled substances that are maintained electronically must be readily retrievable from all other records. (b) Electronic records must be easily readable or easily rendered into a format that a person can read. They must be made available to the Administration upon request. (c) CSOS certificate holders must maintain a copy of the subscriber agreement that the Certification Authority provides for the life of the certificate.