No Post Selection Repair

This paper establishes a strict impossibility result: violations of admissibility cannot be repaired by post-selection. It proves that once a claim, inference, or reference fixation is made inadmissibly, no subsequent filtering, conditioning, reinterpretation, or selective retention of outcomes can restore standing. The result is structural and eliminative. The paper does not analyze specific post-selection techniques, statistical procedures, or correction methods. Instead, it shows that post-selection functions by discarding failures while preserving apparent success, substituting outcome curation for admissible reference and scope fixation. Such moves preserve agreement but destroy standing. The analysis blocks a broad class of practices in which illicit assumptions are retrospectively “fixed” by conditioning on successful cases, reweighting results, or redefining the relevant domain after the fact. It demonstrates that these practices conflate empirical adequacy with admissibility, masking foundational violations behind selective survival of results. This work is purely boundary-setting. It introduces no operational repair strategies, no enforcement mechanisms, and no methodological prescriptions. Its contribution is to delimit what post-selection can and cannot do, clarifying that admissibility violations are terminal and cannot be repaired by retrospective filtering or reinterpretation.