tl;dr: Brown University economics professor Roberto Serrano caught at least 50 students cheating on a take-home midterm using ChatGPT, after the class averaged 96/100 but dropped to 48/100 on an in-person final—with 22 of 27 no-shows having previously scored perfect 100s. Serrano criticized Brown's administration for responding with silence and is abandoning take-home exams, while urging broader debate on AI-enabled academic fraud. The incident reflects a wider trend: Princeton recently ended its 133-year-old unproctored honor code system in response to AI cheating.