Is there a list of drugs that will disqualify a driver?

No, the DOT has not issued a list of disqualifying drugs. Drivers are legally able to use almost any non-Schedule I drug as long as they have a valid prescription and the prescribing doctor is familiar with their driving duties and has told them that it won�t have an effect on safe driving ability. Methadone and medical marijuana are not allowed, however.

Use or possession of any of the substances listed on the Schedules of Controlled Substances while driving can result in disqualification if the driver is caught and convicted. This means that even if a driver�s doctor and employer have approved the use of a certain drug, that driver could still get a DUI for using a controlled substance.