This document provides a historical examination of performance enhancing substances and doping in sports. It defines various performance enhancing drugs such as anabolic steroids, blood doping, and human growth hormone. The document traces the history of doping back to ancient Greece and discusses how various international sports organizations have worked to ban doping over the 20th century. It also profiles three famous athletes - Ben Johnson, Marian Jones, and Lance Armstrong - who were caught doping and discusses some lesser known facts about doping scandals.