In January 2013, Lance Armstrong admitted to using banned substances during his cycling career in an interview with Oprah Winfrey, marking a significant moment in sports history. Armstrong's case highlighted the complexities of doping, as discussed by Andrea Petróczi, a public health professor. Doping is defined by the World Anti-Doping Code, which outlines various violations. Common substances include EPO and anabolic steroids, but detecting doping remains challenging due to factors like microdosing and advancements in training and equipment.