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Chapter 8 of your prescribed text Sports law discusses doping.
To find background information, from the library website select Databases, Abstract and enter Sun Yang CAS. Search. Using the facets on the right, narrow by Full Text.
Articles that may be of use:
Swimming shamed at last as "Houdini of doping control" banned at last
Sun Yang vows to appeal after eight - year ban
Chinese swimming authority "deeply sorry" about CAS decision
"Drug Store" by Open Grid Scheduler / Grid Engine is licenced under CC0 1.0
Four Corners takes you inside one former Essendon player's battle to find out just what was in the supplements he was directed to take.
To find other books search for Sports -- Law and legislation -- Australia in the catalogue