One of the fundamental requirements of a disability discrimination claim is that the employer knew, or reasonably should have known, that the employee had a disability. For obvious reasons, an employer cannot be held liable for discriminating on the basis of a disability it did not know existed.
An employer “knows an employee has a disability” when (1) “the employee tells the employer about his condition,” or (2) “the employer otherwise becomes aware of the condition, such as through a third party or by observation.” Faust v. California Portland Cement Co. (2007) 150 Cal.App.4th 864, 887. When neither the employee nor a third party informs the employer of the disability, California law imposes a much higher standard. In that situation, knowledge will be imputed to the employer based solely on its observations only when “the fact of disability is the only reasonable interpretation of the known facts.” Featherstone v. Southern California Permanente Medical Group (2017) 10 Cal.App.5th 1150, 1167.
This is a pretty difficult standard to satisfy. If an employee has not disclosed a medical condition or requested an accommodation, it is often challenging to prove that the employer should have recognized that unusual behavior or performance issues were caused by a disability rather than something else, especially when the condition at issue is mental rather than physical.







