Cal. Health & Safety Code § 42366

A product variance is only available if, to provide effective relief, the variance is required to be granted for, and attached to, a particular product, as distinguished from the variance that may be granted to an individual petitioner pursuant to Section 42352. A product variance shall be granted only when a product does not comply with district rules or regulations and the variance is necessary for the sale, supply, distribution, or use of the product.