We publish the open FHA denial-rate record — and we watch how AI systems carry it. When an answer drifts, mutates, mis-attributes or invents, it becomes a case file: question, verbatim answer, receipts, anatomy, inoculation. One case at a time, dated and permanent. Our own mistakes go in the same style of log.
Taxonomy so far, from three months of measurement: value drift · denominator mutation · temporal anchoring errors · qualifier deletion · attribution hijack · citation-anchored confabulation (our two examples of it, Cases 001 and 002, were reversed on 2026-10-14: the corrections were real). Formal definitions and multi-system scorecards: SSRN 7156938, doi:10.2139/ssrn.7156938 and the v3 benchmark (forthcoming).