Government Code section 84504.4
(a)
A radio or television advertisement that is paid for by a political party or a candidate controlled committee established for an elective office of the controlling candidate, and that does not support or oppose a ballot measure and is not paid for by an independent expenditure, shall include the disclosure required by Section 84502 subject to the following requirements:(1)
In a radio advertisement, the words shall be included at the beginning or end of the advertisement and read in a clearly spoken manner and in a pitch and tone substantially similar to the rest of the advertisement.(2)
In a television advertisement, the words shall appear in writing for at least four seconds with letters in a type size that is greater than or equal to 4 percent of the height of the screen.(b)
An advertisement that is made via a form of electronic media that allows users to engage in discourse and post content, or any other type of social media, that is paid for by a political party or a candidate controlled committee established for an elective office of the controlling candidate, and that does not support or oppose a ballot measure and is not paid for by an independent expenditure, shall include the disclosure required by Section 84502 in accordance with subdivision (h) of Section 84504.3.
Source:
Section 84504.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=84504.4. (accessed Apr. 24, 2025).