Are sprinters really getting faster?

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First off im a sprinter for my high school team class AA (big school division) Yes sprinters are getting faster, but not because of drug programs. Thats a chep shot at all competitor runners. While I know it happens not every one does it. Its just now these days people are putting in more time getting better the old fashioned way. I feel that track types can influence times for example I would rather run on an all weather track rather than a cinder track anyday