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Professor's Invisible Prompt Catches 32 Students Using AI on Midterm

The episode forces instructors to rethink test design by revealing gaps in AI detection.

Overview

  • Dr. Jason Gibson at Alcorn State said he hid the word “Madagascar” in white text inside a midterm prompt and that 32 of 35 students returned answers containing the nonsensical Madagascar phrases after pasting the question into chatbots.
  • Gibson told students they could appeal their grades and said two did so, with one grade changed after the student said dark mode had kept the hidden text from view.
  • A separate TikTok teacher using a hidden “Gatorade” prompt reported that an AI detector flagged a paper as about 70% AI-generated, indicating similar copying of prompts into chatbots without proofreading.
  • Teachers and professors are shifting test formats toward handwritten or in-person work and requiring AI disclosure while warning that detection tools give probabilistic results and that models can evolve to resist simple prompt injections.
  • The incidents show direct consequences for students who outsource answers and signal likely policy changes on assessment, grading appeals, proctoring, and how schools teach responsible AI use.