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“Why do they do this?” he asks. Because you don’t fail them. Give them a big fat 0 on the assignment, no need to even tell them why.
Then if they beg nicely, let the flunked students do a make-up assignment in the classroom, in front of you, with a pencil and paper and their phones turned off.
One of the best techniques for catching llm use is interviewing, which is now an approved technique in my jurisdiction.
They often don’t have any idea what it is they’ve included, and cannot explain it or offer any further detail.