CPT as a New‑physics Canary

CPT symmetry functions as a compact litmus test: because CPT follows from specific formal assumptions (Lorentz invariance, locality, unitarity), any credible experimental CPT violation would immediately indicate which core assumption(s) must be abandoned. Framing experimental anomalies as potential CPT tests helps prioritize which theoretical and experimental programs to fund and scrutinize. — If CPT ever failed experimentally, it would trigger a foundational scientific and institutional upheaval—redirecting big‑science priorities, funding, and public narratives about the reliability of modern physics.