CDL Downgrades Effective July 22, 2024 Per Federal Regulations, effective July 22, 2024, having a “prohibited” status in FMCSA’s Drug and Alcohol Clearinghouse due to a drug and alcohol program violation will result in losing or being denied a commercial driver’s license (CDL) or commercial learner’s permit (CLP). Visit the Drug and Alcohol Clearinghouse or the CDL section of our website to learn more.