If controlled substances are required, applications should be sent to both the Illinois Department of Profession Regulation and the DEA. Illinois Department of Professional Regulation applications may be completed on forms down loaded from the world wide web (only pages 6-8 are applicable, pg. 6 - instructions, pgs. 7 & 8 - application form). Drug Enforcement Administration (DEA) applications must be completed on DEA issued forms. General information about the DEA's registration process can be found on the world wide web. Additional information concerning the DEA registration process can be obtained from the local DEA Field Division office in St. Louis, MO at (888) 803-1179 or by contacting the Registration Call Center at 1-800-882-9539.