I own a small business in California and we have just had our labor attorney update our employee handbook. Gender identity was added to the equal employement opportunity policy as well as policy against harassment as standard policies by the attorney (not from my input). I thought that was pretty cool. Here is a portion of the policy:
The company strictly prohibits all forms of unlawful harassment, which includes harassment on the basis of race, religion, color, sex, GENDER IDENTITY, sexual orientation, national origin, ancestry, citizenship status, .....
Lisa