Anti-doping law is not primarily about punishing cheaters. It is system-preservation technology — a regulatory architecture designed to protect the integrity of competition as a commercial and cultural asset. The foundational insight of this lecture is that integrity is a governance problem, not a moral one. Sport is commercially and culturally valuable because its outcomes are genuinely uncertain. Doping destroys that uncertainty. The lecture maps the full legal and institutional architecture — WADA, national anti-doping organisations, and the Court of Arbitration for Sport — and stress-tests the system through three case studies: cocaine and the illicit drug boundary, the Shayna Jack case, and the Essendon saga.