Together with former Canadian swimmer Karin Helmstaedt, Seppelt made the documentary film Staatsgeheimnis Kinderdoping (State Secret Child Doping) about the perpetrators and victims of doping in East German swimming. It was broadcast by ARD. Together with Holger Schück, he published the book Anklage: Kinderdoping. Das Erbe des DDR-Sports (Indictment Doping: The Legacy of East German Sports) in 1999. It also dealt with the topic of state doping in Communist East Germany.
In 2006, Seppelt reported extensively about the doping problem in cycling. Among other things, his research led to the identification of the German physician Markus Choina as a member of the doping network organized by Spanish doctor Eufemiano Fuentes.[1] In November of that year, he was awarded the Leuchtturm für besondere publizistische Leistungen (Lighthouse Prize for Special Journalist Achievement) by the journalists’ association Netzwerk Recherche for his research, reports and exclusive revelations about cyclists Jan Ullrich and Floyd Landis and Eufemiano Fuentes.[2]
In the television report Mission: Sauberer Sport (The Mission to Clean Up Sports), Seppelt and Jo Goll documented the work of German doping controllers. The film highlighted flaws in Germany’s doping-control system and caused heady public discussions, which contributed to structural changes in Germany’s National Anti Doping Agency (NADA). The report won the Silver Chest Award 2007 at the International Television Film Festival in Plovdiv and the international Sports Movie and TV Award 2007 in Milan.[3] The film was also nominated for the German Television Prize and the Prix Europa.
In mid-January the German Skiing Association (DSV) took legal action, and a Hamburg court issued an injunction against Seppelt for refusing to make a cease-and-desist declaration demanded by the DSV about suspicions that German cross-country skiers and biathletes had engaged in blood doping in a Vienna laboratory.[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 ruling was based constitutional guarantees of journalist freedom in cases of anonymous sources. The judgment also overturned an injunction from October 21, 2008.[5] Seppelt’s suspicion could not be proved after extensive investigations.
In January 2012 Seppelt and colleagues from the Western German public broadcaster WDR had reports featured on ARD and WDR sports programs about the blood of thirty athletes being exposed to ultra-violet radiation by a sports doctor in the Eastern German city of Erfurt. Several of the athletes concerned were named. In the wake of the broadcasts, a discussion arose as to whether such procedures were banned according to the World Anti-Doping Agency (WADA) code. WADA itself considered them to be.[6] Anti-doping investigations of the athletes ended up with discontinuations and acquittals due to extenuating circumstances, and a criminal investigation of the doctor concerned was also discontinued. Nonetheless, many experts declared that blood treatments were banned in principle by the laws governing sports. 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.”[8]