Requirements of the Americans with Disabilities Act [2.2.2.I.a]

Title I of the Americans with Disabilities Act (ADA) of 1990 prohibits private employers, state and local governments, employment agencies, and labor unions from discriminating against qualified individuals with disabilities in job application procedures, hiring, firing, advancement, compensation, job training, and other terms, conditions, and privileges of employment. A qualified employee or applicant with a disability is an individual who, with or without reasonable accommodations, can perform the essential functions of the job in question.

The full text of the ADA legislation  is available online. The ADA website also has general information, frequently asked questions about the ADA, and an overview of employment laws that apply to employees with and without disabilities.