Recent news of Olympic doping scandals have led to strict penalties and a closer look at steroid testing. Chemistry plays a huge role on both sides of the performance-enhancing drug battle. On one side are officials and scientists, aiming to keep the competitions fair; on the other are underground or overseas chemists, creating new drugs to cheat the system. This week, Reactions goes into the science of steroids — what they are, what they do and how scientists test for them.

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