Amos won Silver at London where the WR was set that day by Kenya's David Rudisha.
Tested positive for GW1516 which in mouse studies boosted endurance by 70%:
But the trials were killed & no human clinical were done after some of the mice developed cancer.
Can be detected up to 40 days after a single 15mg dose:
Detection of PPARδ agonists GW1516 and GW0742 and their metabolites in human urine - PubMed
Peroxisome proliferator-activated receptor-δ (PPARδ) agonists are the drug candidates with potential performance-enhancing properties, and therefore their illegitimate use in sports should be controlled. To simulate the metabolism of PPARδ agonist GW0742, in vitro reactions were performed which...
pubmed.ncbi.nlm.nih.gov