ELI5 Doping - why isn’t caffeine on the banned list?

How long has doping been a problem? What does doping have to do with the word beserk? Who was the first person to get disqualified for doping and what did he take (the answer may surprise you)? Why is it so hard to detect? How did Lance Armstrong get away with it for so long? Why isn’t caffeine on the banned list?

... we explain like I'm five

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