Detectors report a probability about how text was produced. Faculty have to make decisions that need evidence they can inspect and explain, and a score supplies none of the process that makes a decision defensible.
Version histories and process logs looked like a sturdier alternative to AI detection — until tools appeared that manufacture them. A process trace holds up better when it is tied to explanation than when it is treated as proof on its own.
A finished artifact no longer proves who did the thinking behind it. The better move isn't to authenticate the document — it's to let the student authenticate the learning.