AI companion chatbots will have to remind users in California that they’re not human under a new law signed Monday by Gov. Gavin Newsom.

The law, SB 243, also requires companion chatbot companies to maintain protocols for identifying and addressing cases in which users express suicidal ideation or self-harm. For users under 18, chatbots will have to provide a notification at least every three hours that reminds users to take a break and that the bot is not human.

It’s one of several bills Newsom has signed in recent weeks dealing with social media, artificial intelligence and other consumer technology issues. Another bill signed Monday, AB 56, requires warning labels on social media platforms, similar to those required for tobacco products. Last week, Newsom signed measures requiring internet browsers to make it easy for people to tell websites they don’t want them to sell their data and banning loud advertisements on streaming platforms. 

AI companion chatbots have drawn particular scrutiny from lawmakers and regulators in recent months. The Federal Trade Commission launched an investigation into several companies in response to complaints by consumer groups and parents that the bots were harming children’s mental health. OpenAI introduced new parental controls and other guardrails in its popular ChatGPT platform after the company was sued by parents who allege ChatGPT contributed to their teen son’s suicide. 

“We’ve seen some truly horrific and tragic examples of young people harmed by unregulated tech, and we won’t stand by while companies continue without necessary limits and accountability,” Newsom said in a statement.

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One AI companion developer, Replika, told CNET that it already has protocols to detect self-harm as required by the new law, and that it is working with regulators and others to comply with requirements and protect consumers. 

“As one of the pioneers in AI companionship, we recognize our profound responsibility to lead on safety,” Replika’s Minju Song said in an emailed statement. Song said Replika uses content-filtering systems, community guidelines and safety systems that refer users to crisis resources when needed.

Read more: Using AI as a Therapist? Why Professionals Say You Should Think Again

A Character.ai spokesperson said the company “welcomes working with regulators and lawmakers as they develop regulations and legislation for this emerging space, and will comply with laws, including SB 243.” OpenAI spokesperson Jamie Radice called the bill a “meaningful move forward” for AI safety. “By setting clear guardrails, California is helping shape a more responsible approach to AI development and deployment across the country,” Radice said in an email.

One bill Newsom has yet to sign, AB 1064, would go further by prohibiting developers from making companion chatbots available to children unless the AI companion is “not foreseeably capable of” encouraging harmful activities or engaging in sexually explicit interactions, among other things.