Introduction

David Guttenfelder/Associated Press

This week a judo fighter became the first athlete to be expelled from the Olympics for failing an in-competition doping test, in his case, for marijuana. And on Tuesday, it was announced that the defending 50k Olympic race walk champion, Alex Schwazer, was expelled after testing positive for the blood booster erythropoietin, or EPO. Meanwhile, the “unbelievable” times of one swimmer have raised suspicions of doping.

But has doping become so common that we shouldn’t even bother with testing, or are the dangers to athletes and fair competition so great that enforcement must continue?