How was the policy created by the americans with disabilities act changed after it was implemented?

The Americans with Disabilities Act is a law enacted by the United States Congress in 1990. It was signed on July 26, 1990, by President George HW Bush, and then amended with changes and put into effect on January 1, 2009.  

ADA is a broad civil rights law that prohibits, in certain circumstances, discrimination based on disability. The law offers similar protection against discrimination to Americans with disabilities such as the Civil Rights Act of 1964, which legislates for discrimination based on race, religion, sex, national origin and other illegal characteristics. Disability is defined by ADA as "a physical or mental impairment that substantially limits a major life activity." The determination of whether any condition is considered a disability is made on a case-by-case basis. Certain specific conditions are excluded as disabilities, such as substance abuse and visual impairment that can be corrected with prescription lenses.

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