While looking into illegal doping in sports, filmmaker Bryan Fogel got in touch with Grigory Rodchenkov, the director of Russia's national anti-doping laboratory. Over the course of their correspondence, Fogel found out that Russia had a state-sponsored Olympic doping program that Rodchenkov managed. Rodchenkov eventually testified that his team switched out urine samples that had steroids with clean ones, his confessions culminating into this documentary.
Where to watch it: Netflix