§ 4801. Definitions. When used in this article:

1. "Workplace" means any location away from the home, permanent or temporary, where any employee performs any work-related duty in the course of his employment.

2. "Toxic substance" means any substance which is listed in the latest printed edition of the National Institute for Occupational Safety and Health Registry of Toxic Effects of Chemical Substances or has yielded positive evidence of acute or chronic health hazards in human, animal or other biological testing.

3. "Employer" means any individual, partnership, corporation or association engaged in a business who has employees including the state and its political subdivisions. The term "employer" does not include the employment of domestic workers or casual laborers employed at the place of residence of his or her employer.