The California AI Defenses Law (AB 316) closes a potential loophole in lawsuits over AI harms. Under the law, a defendant who developed, modified, or used an AI system cannot escape liability by arguing that the AI acted autonomously and caused the harm on its own. It has been in effect since January 1, 2026.
What the California AI Defenses Law Changes
In plain terms, “the AI did it” is not a legal defense in California. Whoever built, changed, or deployed the system remains answerable in court for what it does, no matter how independently the technology appears to operate.
What Defendants Can Still Argue
Businesses that build or deploy AI remain able to raise normal defenses such as causation, foreseeability, and comparative fault. The practical takeaway is that responsibility for an AI system’s output stays with the humans and companies behind it, so contracts, testing, and oversight practices carry real legal weight for anyone shipping AI products in the state.
Source: California Legislative Information: AB 316
Report a violation: If you believe a business is violating this law, you can file a complaint with the California Attorney General Consumer Protection.
