[Code of Federal Regulations] [Title 21, Volume 1] [Revised as of April 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR1311.15] [Page 144] 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. 1311.15 Limitations on CSOS digital certificates. (a) A CSOS digital certificate issued by the DEA Certification Authority will authorize the certificate holder to sign orders for only those schedules of controlled substances covered by the registration under which the certificate is issued. (b) When a registrant, in a power of attorney letter, limits a certificate applicant to a subset of the registrant's authorized schedules, the registrant is responsible for ensuring that the certificate holder signs orders only for that subset of schedules.