Not Legal Advice: Most states have adopted the FMCSA regulations for commercial drivers and alcohol, which set a 0.04 percent blood-alcohol concentration limit. This is half the BAC limit for non-commercial drivers in most states. The FMCSA rules also stipulate that commercial drivers may not operate a commercial vehicle within four hours of using alcohol.
Sanctions for alcohol-related driving violations may affect the driver's qualification and eligibility for both commercial and non-commercial licenses.
While FMCSA sets the minimum standards that States must meet regarding CDLs and Commercial Learner's Permits (CLP), administration of the actual CDL program and issuance of the license itself remains the exclusive function of the States.
States may determine the application process, license fee, license renewal cycle, renewal procedures, and reinstatement requirements after a disqualification; provided that the Federal standards and criteria are met. States may exceed the Federal requirements for certain criteria, such as medical, fitness, and other driver qualifications.
For more info, visit www.fmcsa.dot.gov.
Check out Strategies to Reduce or Prevent Drunk Driving from CDC.gov.