Drug assessments and biological copyright facts furnished scientific evidence of Armstrong's doping. Retrospective Evaluation of saved urine samples in the 1999 Tour de France revealed traces of EPO. Complex strategies were made to avoid good tests. This involved very careful timing of drug administration and the use of masking brokers. https://abcnews.go.com/US/lance-armstrong-doping-investigation-widens/story?id=13663557