21 CFR § 1311.35 - Number of CSOS digital certificates needed.

---
identifier: "/us/cfr/t21/s1311.35"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 1311.35 - Number of CSOS digital certificates needed."
title_number: 21
title_name: "Food and Drugs"
section_number: "1311.35"
section_name: "Number of CSOS digital certificates needed."
chapter_name: "DRUG ENFORCEMENT ADMINISTRATION, DEPARTMENT OF JUSTICE"
part_number: "1311"
part_name: "REQUIREMENTS FOR ELECTRONIC ORDERS AND PRESCRIPTIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 821, 828, 829, 871(b), 958(e), 965, unless otherwise noted."
regulatory_source: "70 FR 16915, Apr. 1, 2005, unless otherwise noted."
cfr_part: "1311"
---


# 1311.35 Number of CSOS digital certificates needed.

A purchaser of Schedule I and II controlled substances must obtain a separate CSOS certificate for each registered location for which the purchaser will order these controlled substances.