Today at 15.35 the world's fastest men enter the World Cup in the 100 meter trials.

American Justin Gatlin, who has been doping twice, is one of the medal favorites. This year, the 37-year-old has the fourth fastest time of the year at 9.87. Six hundredths behind world leader Christian Coleman at 9.81.

But SVT expert Alhaji Jeng does not think Gatlin should be allowed to join.

- No, he should not compete in the World Cup. Personally, I think that when it is so intentional and strategic you should be shut down for life. I think one should set an example. That he runs at times better than when he got stuck 10-15 years ago is an extremely remarkable development, he says.

Coleman was freed by technology

On the other hand, Jeng believes that Christan Coleman's participation is more problematic. The American was threatened with suspension after being absent from the mentioned stay reporting three times in one year, but was regularly rescued by a technicality.

- As an athlete, you understand Wada's job. But the system is flawed in a way. People travel, maybe train two workouts a day and compete. You have to tell a quarter before where you think you should be. It is very common to get bars. I've had it 1-2 times. For several years they have been talking about a chip that reveals where you are. I really don't think he stayed away, he says.

"A sportsman's biggest nightmare"

Jamaica sprint sensation Briana Williams was also recently released after getting caught in a doping test. Williams got stuck with the banned substance Hydrochlorothiazide in the body. However, the 17-year-old was given the substance via contaminated cold medication, which was not on the table of contents but was discovered after independent testing of the tablets.

That is why Jeng sees no problems with her getting ready to compete in the World Cup. However, she pulled out.

- It's an athlete's biggest nightmare. You have to be a doctor to be able to find out which chemical substances are in the pills. Few athletes have the medical skills. The only thing you can do is read through the table of contents, he says.