Final answer:
Controlled substance dispenser registrations start with the letters DEA. DEA stands for Drug Enforcement Administration. Anyone who manufactures, distributes, imports, exports or dispenses controlled substances is required to have a registration number.
Step-by-step explanation:
The controlled substance dispenser registrations start with the letters DEA. DEA stands for Drug Enforcement Administration. The DEA is an agency of the U.S. Department of Justice that enforces controlled substances laws and regulations. The registration is required for anyone who manufactures, distributes, imports, exports, or dispenses any controlled substance, and the registration number typically starts with the letters 'DEA' followed by a series of numbers.