Germany's record sprinter scythes over the hundred meters a week need so much or better to register their residency information for doping tests online. It takes so long or short to prove its cleanliness. Not for long. "I think 99.9 percent of the athletes get to fill these whereabouts sensibly. This is not rocket science that you have to have studied for it." Reus

Most recently, however, there had been international discussions on these anti-doping provisions. Above all, the importance of the information. The Athletics Independent Integrity Commission (AIU) has banned two prominent faces of the sport, US sprinter Christian Coleman and Bahrain's 400m runner Salwa Eid Naser, for missing three and four tests in 12 months respectively. In international sport, this does not count as evidence of doping - but as a critical violation of anti-doping regulations.

If the suspensions are confirmed and both are suspended, Tokyo could take place in 2021 without two current world champions. Much greater than the loss of athletic class, however, could once again be the damage to sport and its integrity that both are doing. 

None of them apologized for their behavior. Naser reacted defiantly and relativist. Missing three tests is "normal," she said. Coleman did not leave it at a justification. He went straight into the attack.

"Was intentional so I miss a test" 

His Twitter statement included three pages. He said he had only briefly bought Christmas presents on the day of the third Test, which he missed on December 9, five minutes away from home. He was "more than ready and available". He could have been called by the inspector at any time - yes, he writes. After all, it was otherwise the case. That's how he portrays it. The fact that this did not happen shows for him: "That was the intention so that I could miss a test." Who knows, the inspector may not have been at his home at all.

Serious allegations that call into question the integrity of the testers and thus the whole system. However, the AIU does not want to respond to the individual case just speak in general. In fact, "calls are not common at all", the Commission says. For good reason: "Any announcement of a test gives an athlete the opportunity to falsify or circumvent or other inadmissible behavior, which limits the effectiveness of the test."

The change of residence information, contrary to what Coleman described, can be changed "at any time" via an app or even SMS. "The only requirement is that this happens as soon as possible when circumstances change."

Naser and Coleman have never actually been convicted of doping. Both repeatedly and vehemently deny taking performance-enhancing substances. This must be kept as a fact, even if the missed tests raise questions - perhaps even doubts among skeptics. In Coleman's gold discipline alone, the legendary hundred meters, nine of the ten fastest in the history of doping have been convicted. Missed tests do not exactly contribute to credibility.

In any case, the question of how serious two world champions are about anti-doping regulations - and ultimately with the value of cleanliness in the sport for which they have been used - surely arise.