Steriods and Baseball

Former Senate Majority Leader George Mitchell is concerned with the aspect of steriods in baseball. He had collected tons of data and documents and conducted hundreds of interviews but Mitchell will not state exactly what he is trying to figure out through the collection of this data. I think that is a little odd...and I guess my main question is why steriods seem to be such a bigger issue in baseball than in any other sport?? You would think those involved in my contact related sports like football would seem more likely to take steriods. Just my opinion, go figure! :)