Hi, Akekaomen! I'm going to refer you to forum member TheByzantine. In the meantime, here are some USA-skewed Web resources:

US Family Medical & Leave Act
Home Page at the U.S. Department of Labor, Wage and Hour Division (WHD)

Discrimination
National Alliance on Mental Illness (NAMI)
ADS Center (Resource Center to Address Discrimination and Stigma established by the US federal Substance Abuse and Mental Health Services Administration - SAMHSA)

Depression & the Workplace
PC article: Workplace Depression
PC article: Mental Health & Work
PC article: Mental Illness in the Workplace: Talking to Your Employer
PC article: Mental Illness in the Workplace: Rights and Responsibilities
Mental Health America Factsheet: Depression in the Workplace
What Is an At-Will Employee?
The Americans With Disabilties Act and You