Among other things, his research led to the identification of the German physician Markus China as a member of the doping network organized by Spanish doctor Eufemiano Fuentes.
[2] In the documentary "Mission: Clean Sport" Hajo Seppelt and Jo Goll documented the work of German doping control officers.
[4] A superior court in Hamburg overturned that ruling in Seppelt's favor, concluding that DSV had no right to demand the cease-and-desist declaration because it was not affected by the journalist's reporting.
The doctor tried to get a superior court in Cologne to issue an injunction against WDR,[7] but the broadcaster won out, and the report was allowed to contain references to "forbidden blood treatments.
The documentary Doping – Top Secret: The Shadowy World of Athletics shows that it is relatively easy to obtain banned performance-enhancing drugs in Kenya.
Shortly before the IAAF World Championships in London, German broadcaster ARD aired a new episode of Doping Top Secret in August 2017, titled "The Big Money Run.
The feature by Hajo Seppelt, Benjamin Best, Ulrike Unfug, and Grit Hartmann particularly examines people surrounding and influencing African Athletes in track and field disciplines.
The film presents evidence for these allegations in form of footage and audio recordings secretly made by the whistleblowers as well as official documents.
[14] In November 2016 the documentary "Doping – Top secret: The protection racket" (by Hajo Seppelt, Florian Riesewieck, Olga Sviridenko and Felix Becker) was aired in ARD's weekly programme "Sportschau".
[17][18] In May 2018 Seppelt and Florian Riesewieck produced another episode of the documentary series "Doping Top Secret" on ARD – titled "Russia's Football Friends".
Other secret footage also captures a doctor with the Moldovan weightlifting team claiming that they used doppelgangers to give urine samples for athletes in exchange for payments.
The documentary also made claims of corruption against the IWF and its president, Tamás Aján, resulting in him stepping aside from the role pending an investigation and resigning as an IOC honorary member.
[24] Prior to the 2008 Summer Olympics in Beijing, ARD broadcast the 45-minute-documentary "Flying High in the Middle Kingdom: Doping in China", which Hajo Seppelt produced with Jo Goll.
It emerged that the UCI had wanted to keep secrets a positive test by Contador for the substance Clenbuterol at the Tour de France in July 2010.
[28] In May 2011, Seppelt and co-filmmaker Kempe had the chance to film footage about sports for a week in Pyongyang, the capital of North Korea.
In 2013, Seppelt and Kempe completed a critical documentary about Thomas Bach, shortly before he was elected president of the International Olympic Committee.
In April 2017, Hajo Seppelt and his colleague Thilo Neumann revealed the existence of positive doping tests for Clenbuterol in the context of follow-up checks during the 2008 Olympic Games in Peking.
The IOC's declaration, stating that the positive tests were a result of the athletes' consumption of meat from China which supposedly contained Clenbuterol and that therefore there where no investigations concerning other possible causes, engendered worldwide criticism.
In June 2017 the German Broadcaster a new Episode of "Doping Top Secret", titled "Brazil's dirty game", was aired by ARD.
The documentary by Hajo Seppelt, Florian Riesewieck und Thilo Neumann examined the topic of doping in the host country of the last Football World Championships and of the last Olympic Games.
Additionally, a multitude of indications for a culture of doping, deeply rooted in Brazil Football and stretching up to the national elite could be found.