The California legislature concurred 40-0 on Aug. 31 in Assembly amendments to SB 1050, sending the first-in-nation synthetic-performer ad-disclosure bill to Gov. Gavin Newsom, who has until Sept. 30 to sign or veto. The unanimous margin is the tell: an issue that could’ve partisan-coded (AI creative, speech rules, advertiser costs) instead moved through as consumer-protection housekeeping.

The bill makes it unlawful to publish an advertisement that “prominently includes a synthetic performer without a clear and conspicuous disclosure.” “Prominently” is defined to cover a synthetic performer in the foreground demonstrating a product, voicing narration, or reacting to the commercial message, which is a fairly precise description of how cheap AI tools are already being used in paid social creative. The disclosure must be substantially similar to “this performance features a synthetic performer” or “no human performer is depicted.” Enforcement rides on California’s existing unfair-competition and false-advertising statutes, Sections 17200 and 17500, and courts may order advertising mediums to stop transmitting a non-compliant ad once served.

The Senate Judiciary Committee framed the bill as a response to “hyper-realistic clones, deep-fake influencers and A.I. spokespersons.” That framing does the political work: this isn’t regulating AI, it’s updating false-advertising law for a synthetic-media era.

SB 1050 is one of 16 AI bills the legislature passed before adjourning Aug. 31, part of a wider push covered in our California AI session close-out and the 30-day signing-clock tracker. For a running watch on this specific bill, see the SB 1050 signing-clock tracker. California ad law tends to become national ad law by default. Advertisers who assumed disclosure was somebody else’s problem now have four weeks to find out.

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