Original: Narcotics registration The DEA has a registration system in place which authorizes medical professionals, researchers and manufacturers access to "Schedule I" drugs, as well as Schedules 2, 3, 4 and 5.
Simplified: Narcotics registration The DEA has a system in place which allows doctors and other people allowed to prescribe medicines, researchers and manufacturers access to "Schedule I" drugs, as well as Schedules 2, 3, 4 and 5.