The structural novelty of SB 951 is not the extended notice window — it is the attribution requirement. Existing California labor law already mandates advance notice for mass layoffs under the state WARN Act; what the California Worker Technological Displacement Act adds is a categorical trigger: when automation or AI systems are the primary driver of job elimination, the employer must say so, 90 days in advance. That legal causation standard has no precedent in U.S. labor law, which is why the bill's opponents are focused on the definitional problem…