Deukmejian

The primary issue raised by this appeal is whether Proposition 105, an initiative measure, violates the single-subject rule contained in article II, section 8, subdivision (d) of the California Constitution. Having determined that it does, we reverse the judgment denying the petition for writ of mandamus which sought to halt implementation of the measure.

I

Proposition 105 on the November 9, 1988, general election ballot was adopted by the voters of this state. By its own provisions, the substantive portions of the initiative measure did not become operative until January 1, 1990.

The initiative is entitled the “Public’s Right to Know Act.” Paraphrasing the provisions, the measure is divided into the following parts: (1) A provision entitled “Household Toxic Products Disclosure” requiring that businesses advertising a household toxic product provide a warning that the product should not be placed in the trash or poured down the drain and that the Department of Health Services issue regulations defining what are household toxic products. (2) A provision entitled “Seniors Health Insurance Disclosure” requiring that public advertisements for insurance policies…