Steriods were on the market 40 years before testing was established in 1976 and WADA wasn't around until 1999 and wasn't full operating at that time .would you say that the modern era of track has atleast a little more doping control.
Always have more positive tests, but that is only because we are testing more. That's what I think about alot of countries that have alot of athletes testing positive too, it isn't necessarily more dopers it's stricter testing.