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  1. Controlled substance - Wikipedia

  2. What Is a Controlled Substance? Schedule, List, Types - Healthline

  3. The Controlled Substances Act - DEA.gov

  4. Diversion Control Division | Controlled Substance Schedules

  5. Controlled Substances & CSA Schedule Lists - Drugs.com

  6. Drug Scheduling - DEA.gov

  7. The Controlled Substances Act

  8. Controlled Substance Schedules - StatPearls - NCBI Bookshelf

  9. DEA Diversion Control Division

  10. Overview of Controlled Substances | National Institute of Justice