Cal. Bus. & Prof. Code § 26121

(a) On or before July 1, 2025, the department shall reevaluate regulations adopted pursuant to Section 26120 to determine whether any additional warnings are necessary to reflect evolving science and shall adopt regulations for cannabis and cannabis product labels or inserts reflecting the evolving science regarding the risks that cannabis use may cause consumers.

(b) (1) On or before January 1, 2030, and every five years thereafter, the department shall reevaluate the regulations adopted pursuant to subdivision (a) to determine whether requirements imposed in those regulations reflect the state of the evolving science on cannabis health effects and on effective communication of health warnings.

(2) The Legislature recommends that the department, and the department may, use research funded pursuant to subdivision (b) of Section 34019 of the Revenue and Taxation Code that evaluates labeling and packaging, and, in conformance with the provisions of that subdivision, the department may commission new research to assess the efficacy of the warnings required by subdivision (a) and approaches to identify future best practices for cannabis health warning labels that are most effective in changing knowledge and intent to consume or consumption.

(c) Cannabis or cannabis products manufactured before July 1, 2025, may be sold before July 1, 2026, without meeting the labeling requirements imposed by the regulations adopted pursuant to subdivision (a).

(d) Cannabis or cannabis products manufactured before January 1, 2030, and every year thereafter when new labeling requirements are imposed by the regulations adopted pursuant to subdivision (a) may be sold for up to 12 months from the effective date of those regulations, or for a shorter period of time as prescribed by the department in those regulations, if they comply with the regulations in effect prior to the enactment of the new regulations.