The Americans with Disabilities Act is a piece of legislation that has been on the books since 1990. It prohibits discrimination against persons with disabilities in employment, housing, government activities, communications, and public transportation. Any disabled person that is discriminated against in one of these areas may take a case to the related tribunal. In normal circumstances, the disabled person will win a right to do something such as ride a train or perform a certain job. Any company that is sued under this act must show that it would create undue hardship for them to comply with the disability law. Otherwise, the law stands absolute.
If a company can show that the type of work being applied for by the disabled person is always done by a non-disabled person for reasons of safety, the courts will find on the side of the company. Many companies and buildings are forced to make accommodations for disabled use when called upon to do so.