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Brazilian legislators weren’t aware they passed a law written by ChatGPT.

The city of Porto Alegre passed an ordinance that prevents folks whose water meters were stolen from being charged. Sounds benign, but city councilman Ramiro Rosário told AP that he didn’t disclose the fact he’d used ChatGPT to write the law until after it went into effect. According to Rosário, he intentionally kept it secret and hoped to “spark debate.”

Rosário also told g1 he chose a simple and uncontroversial topic for his experiment. Even so, it’s an unsettling precedent given that chatbots are known to introduce factual errors.