Using a detector is not automatically illegal, but running a hidden pipeline that disciplines students on an opaque score is a fairness and process problem — and in some jurisdictions a privacy one. Laws differ; this is not legal advice.
Schools that stay on safer ground publish a clear AI-use policy, tell students when detection may be used, keep humans in the decision, and offer a path to discuss flagged work. Pasting sensitive student writing into a random free website without a vendor review is the riskier pattern.
