My university uses prompt injection to catch cheaters

Good. I wouldn't like cheaters to compete with honest students on the job market.

In my kid's school (American high school equivalent) being caught on using LLM in papers is a failed subject. Students must pass all the subjects to finish the school. Some of these subjects won't be taught the next year so effectively they lose year, two, three....

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Prompt injecting homework assignments is a funny idea, but doesn't seem very productive.

Either the teacher needs to adjust how they are teaching new concepts or the student needs to ask themself why they are attending college in the first place.