Before the Winter Olympics in Sochi, Russia created a storage bank of clean, frozen urine
Russia's security service, the FSB, worked in a building next to the Sochi laboratory, swapping positive urine samples for clean negative ones through a "mouse hole", adding table salt to make them weigh the same
A key FSB agent had access to the Sochi anti-doping laboratory, disguised as a sewage and plumbing contractor
http://www.bbc.com/sport/36823453
If that's all true Hollywood can make a decent movie out of the whole story...