Doping against the sportsmanship?

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Doping has been a part and parcel of every sport, be it cricket, football or Olympics. The recent ban on pakistani cricketers shows how deep this has gone into the sports. The medicines used for increasing stamina are being used as a winning strategy. But how do these players get though the doping test before the matches? But later they are identified for having the drugs in their body. Do you think its a planned activity? should it not be banned at the first place itself?