In sports, the rules are meant to be sacrosanct. But when it comes to performance-enhancing drugs, the slope is super-slippery. (Part one of a two-part series.) SOURCES:April Henning, associate professor of international sport management at Heriot-Watt University in Edinburgh, Scotland.Aron D'Souza, founder of the Enhanced Games.Floyd Landis, former professional cyclist, founder of Floyd's of Leadville.Louisa Thomas, staff writer at The New Yorker. RESOURCES:Doping: A Sporting History, by April Henning and Paul Dimeo (2022)."The Man Who Brought Down Lance Armstrong," by Matt Hart (The Atlantic, 2018).Cycle of Lies: The Fall of Lance Armstrong, by Juliet Macur (2014).Positively False: The Real Story of How I Won the Tour de France, by Floyd Landis (2007).Alice's Adventures in Wonderland, by Lewis Carroll (1865). EXTRAS:"Has Lance Armstrong Finally Come Clean?" by Freakonomics Radio (2018). Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.