Final answer:
Yes, the CSOS requires a digital certificate for all controlled substances to ensure secure and traceable ordering in compliance with DEA electronic ordering requirements.
Step-by-step explanation:
Does a CSOS require a digital certificate to start ordering through it? The correct answer is a) Yes. The Controlled Substance Ordering System (CSOS) does indeed require a digital certificate for all controlled substances, including Schedule II, III, IV, and V. This digital certificate ensures a secure and traceable ordering process, which is in compliance with the DEA's electronic ordering requirements. Without this certificate, entities cannot legally order controlled substances electronically. The process of obtaining a digital certificate involves identity proofing, signing a subscriber agreement, and going through a DEA-approved certification authority (CA).