# Purdue CS240 instructor apologizes for AI cheating response amid backlash

Digest AI · Society & Work · published 2026-09-25T00:00:00Z

Canonical: https://digestai.news/story/purdue-cs240-instructor-apologizes-for-ai-cheating-response-amid-backl

## Summary

A Purdue University instructor detailed how the CS240 course handled AI-assisted cheating in Spring 2026, starting with a tool called Argus that flagged 267 of 584 students for suspicious code patterns. The instructor sent emails to 267 students, requiring them to self-report violations by April 20, 2026, or face an automatic F grade. Of those, 117 responded—108 admitted wrongdoing, while 9 disputed the findings. The process led to 144 students dropping the course, but 74 later re-enrolled after the university reversed retroactive penalties and allowed re-entry.

The instructor acknowledged missteps, including the timing near the course drop deadline and the form’s coercive language. Argus, a static analysis tool, detected AI-generated code markers that surged post-2024, with performance gaps of 10.75% and 14.5% on midterm exams for flagged students. The instructor also noted public backlash, including media coverage and protests, while emphasizing that Argus was not an LLM but a pattern-matching system. The resolution prioritized fairness over strict enforcement, though the instructor expressed regret over perceived inequities for innocent students.

## Key points

- Argus flagged 267 of 584 students for suspicious code, with 117 responding to the April 20, 2026 email
- 144 students dropped CS240 after the process, but 74 later re-enrolled after penalties were reversed
- Argus detected AI-generated code markers with a 10.75%–14.5% performance gap on midterms

## Why it matters

The case highlights tensions between AI detection tools, academic integrity, and student stress, with implications for universities adopting similar systems.

## Sources

1. [CS240 AI Cheating Retrospective](https://turkeyland.net/thoughts/ai.php) (turkeyland.net, 2026-09-25)

## Cite

Digest AI, "Purdue CS240 instructor apologizes for AI cheating response amid backlash", 25 September 2026, https://digestai.news/story/purdue-cs240-instructor-apologizes-for-ai-cheating-response-amid-backl

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