The World Anti-Doping Agency has detailed serious failings of doping control management at the Rio de Janeiro Olympics, saying the system was only saved from collapsing by the “enormous resourcefulness and goodwill” of some key staff.

In a 55-page report from its independent observer team led by British lawyer Jonathan Taylor, WADA said the logistical issues which put a strain on the testing process were “foreseeable and entirely avoidable” during the games in August.