Relating to: artificial intelligence systems that simulate humanlike relationships with children and providing a penalty.

SB 939 prohibits operators of "companion chatbots" (AI systems designed to simulate ongoing, personalized relationships with users) from making these tools available to children under 18 without specific safety measures. It requires such chatbots to avoid encouraging self-harm, replacing professional mental health care, promoting illegal activity, sharing explicit content, prioritizing validation over safety, or optimizing engagement beyond safety features. Operators face civil penalties of up to $25,000 per violation per day, and affected children or their guardians may sue for damages. The law exempts customer service bots, internal business tools, and research systems, and includes a 2027 implementation deadline.