49 CFR Parts 37 & 38 - Department of Transportation (DOT) ADA Regulations

The definition of "individual with a disability'' excludes someone who is currently engaging in the illegal use of drugs, when a covered entity is acting on the basis of such use. This concept is more important in employment and public accommodations contexts than it is in transportation, and is discussed at greater length in the DOJ and EEOC rules. Essentially, the definition says that, although drug addiction (i.e., the status or a diagnosis of being a drug abuser) is a disability, no one is regarded as being an individual with a disability on the basis of current illegal drug use.

Moreover, even if an individual has a disability, a covered entity can take action against the individual if that individual is currently engaging in illegal drug use. For example, if a person with a mobility or vision impairment is ADA paratransit eligible, but is caught possessing or using cocaine or marijuana on a paratransit vehicle, the transit provider can deny the individual further eligibility. If the individual has successfully undergone rehabilitation or is no longer using drugs, as explained in the preamble to the DOJ rules, the transit provider could not continue to deny eligibility on the basis that the individual was a former drug user or still was diagnosed as a person with a substance abuse problem.