For clarification1 wrote:
Where’s your proof that it’s normal? I want cold hard facts
Read for example this peer reviewed article from 2020: doi: 10.3389/fphys.2020.00160
Excerpts:
a) Blood doping in-competition at worlds was 15-18%:
Our results from robust hematological parameters indicate an estimation of an overall blood doping prevalence of 18% in 2011 and 15% in 2013 (non-significant difference) in average in endurance athletes
b) Overall doping in the last 12 months before worlds was 39-62%:
For example, doping (in all forms) prevalence is said to range between 39 and 62% based on anonymous questionnaires answered by athletes competing in two 2011 competitions of the World Athletics
c) Less than 2% are positive:
In fact, official adverse or atypical results occur in less than 2% of the tests performed in laboratories accredited by the World Anti-Doping Agency
Obvious conclusion: the vast majority of drug cheat escapes the testers for a long time, many of them forever. This is not exactly new.