Dermot

Ask what evidence exists beyond the score, in writing, and ask for the policy. Then offer to talk them through your argument, which is the strongest thing you have because you wrote it. Bring your drafts and version history if the document has any.

I mark a couple of hundred a term and I stopped opening the detector score about a year ago. It is decent on raw unedited output and it falls apart once anybody has rewritten the text, which means it catches the laziest cases and nothing else.

What actually gives people away is that the essay answers a slightly different question. It writes a good general piece about the topic and never touches the specific prompt, the set readings, or the thing we argued about in a seminar. An essay floating above the module is the tell, and no software is involved.