Here are the official FIDE anti-doping regulations, which include the justification https://old.fide.com/fide/fide-anti-doping-regulations.html https://old.fide

Here are the official FIDE anti-doping regulations, which include the justification https://old.fide.com/fide/fide-anti-doping-regulations.html https://old.fide.com/fide/fide-anti-doping-regulations.html Tl;dr: They use the world anti-doping agency list.