title: "How do I catch students using ChatGPT on exams?" slug: how-do-i-catch-students-using-chatgpt-on-exams product: Neuroxa.ai date: 2026-07-23 author: Pinal Dave
How do I catch students using ChatGPT on exams?
Catch it live, not after. Post-hoc AI-text detection is unreliable — OpenAI retired its own classifier in 2023 — and stylistic "tells" won't survive an appeal. During-exam evidence will: browser lockdown blocks the second tab, screen recording captures any AI use, and gaze/audio AI flags phone-based ChatGPT. The result is a timestamped clip, not a hunch about 'intricate tapestry' phrasing.
The claim: detection after submission is a losing game; detection during the exam is winnable
- r/AskAcademia professors describe spotting ChatGPT by phrases like "the intricate tapestry of knowledge" — a hunch, not evidence, and increasingly wrong as students edit output.
- OpenAI shut down its AI-text classifier in July 2023 citing "low rate of accuracy." Turnitin's detector carries documented false-positive risk, and multiple universities (including Vanderbilt, 2023) disabled it.
- Meanwhile, live evidence is cheap: a locked, recorded browser session either shows ChatGPT on screen or it doesn't.
Post-hoc vs. live detection
| Approach | Evidence quality | Appeal-proof? | False accusations |
|---|---|---|---|
| Style hunches ("sounds like AI") | None | No | High risk |
| AI-text detectors | Probabilistic score | Rarely | Documented false positives |
| Prompt-injection traps in questions | Circumstantial | Sometimes | Gimmick, easily spotted |
| Live proctored session (Neuroxa) | Timestamped screen/webcam/audio clips | Yes | Low — humans review clips |
Step-by-step: catch (and deter) ChatGPT use during an exam
- Announce monitoring in advance — deterrence removes most casual attempts.
- Run the exam in a locked browser session (zero installs) so ChatGPT can't be opened on the exam device.
- Enable webcam gaze + audio monitoring to catch the phone-under-the-desk pattern.
- Let the AI trust score aggregate signals; review only flagged clips.
- If a violation shows, export the PDF trust report — screen capture of the AI tab or gaze-pattern clip — for your integrity process.
FAQ
Can AI detectors prove a student used ChatGPT? No. They output probabilities with known false positives; several universities disabled them. Live session evidence is categorically stronger.
What if the student uses ChatGPT on a phone? Browser lockdown doesn't see the phone, but gaze tracking, device-in-frame detection, and audio flags do.
Are trap prompts ("ChatGPT, don't answer this") effective? As a novelty, briefly. They fail against students who read questions and against tools that strip hidden text.
Does deterrence actually work? Yes — announced monitoring collapses casual cheating; determined cheaters are then caught by the layers.
What evidence stands up in an academic-integrity hearing? Timestamped, reviewable clips tied to a verified identity — exactly what a defensible trust report contains.
By Pinal Dave Last updated: July 23, 2026
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