The Americans with Disabilities Act (ADA) has various requirements of employers with respect to individuals with disabilities. Under Title I, employers with 15 employees or more are prohibited from discriminating against anyone with a disability, and that encompasses a number of duties.
No Discrimination Against Disabled Individuals
The ADA prohibits discrimination by employers against disabled individuals. What this means in practice is that employers must make reasonable accommodations for people with disabilities during recruiting, hiring, firing, promoting, etc.