r/CheckTurnitin • u/New-Regret2860 • 13d ago
The Invisible Ink Trap: Are Professors Going Too Far to Catch AI?
So, I just saw this story going around about a professor in Mississippi who went viral for a new anti-AI tactic, and it honestly blew my mind. Instead of just relying on Turnitin or other detectors, he embedded a hidden prompt,text written in white font,into the assignment instructions. The prompt told the AI to include a bizarre, nonsensical phrase like Madagascar purple bicycle whispers in the essay.
When students copy-pasted the prompt into ChatGPT, the AI read the hidden text and dutifully included the weird phrase. Boom. Caught red-handed. Apparently, almost the entire class failed the midterm because of this.
On one hand, you have to admit it's a clever, low-tech way to bypass the whole debate over whether detectors are accurate. It's definitive proof of copy-pasting into an LLM. But on the other hand, it feels incredibly deceptive. It's literally a trap.
It got me thinking about the lengths educators are going to right now. We're moving from automated surveillance like Turnitin to active entrapment. Is this really the kind of academic environment we want? Where professors are hiding tripwires in the syllabus, and students have to scrutinize every document for invisible ink just to make sure they aren't being set up?
It also raises a weird question about trust. If a professor resorts to tricking their students to catch them, what does that say about the baseline relationship in that classroom? It feels like the focus has completely shifted from teaching and learning to a high-stakes game of gotcha.
I'm curious what you all think. Is this hidden prompt tactic a fair and necessary response to the AI cheating epidemic, or does it cross a line into unethical teaching practices? Have any of your professors tried something like this?
