What is discrimination based on "relationship or association" under the ADA?

The ADA prohibits discrimination based on relationship or association in order to protect individuals from actions based on unfounded assumptions that their relationship to a person with a disability would affect their job performance, and from actions caused by bias or misinformation concerning certain disabilities. For example, this provision would protect a person whose spouse has a disability from being denied employment because of an employer's unfounded assumption that the applicant would use excessive leave to care for the spouse. It also would protect an individual who does volunteer work for people with AIDS from a discriminatory employment action motivated by that relationship or association.