What caused Mariusz Wach’s positive for steroids?

It was affirmed by the German newspaper Bild that Mariusz Wach, a polish boxer, violated anti-doping policy. This person tested positive for anabolic steroids. The drug testing was conducted before the fight between this athlete and the heavyweight boxing world champion Vladimir Klichko.
According to A-sample of Mariusz Wach, he administered steroids. Results of his B-sample are unknown.
It is necessary to mention that the German newspaper Bild reported about the steroid positive of Mariusz Wach before it was done by the German Boxing Federation. Mariusz Kolodziej, the promoter of the boxer Wach thinks that it displays that the German Boxing Federation doesn’t do its job appropriately. It lacks professionalism totally.
What did Mariusz Wach say in order to defend himself? Actually, the polish boxer didn’t try to defend himself. The athlete only affirmed that he had never applied any anabolic steroids or other banned medicines knowingly. The sportsperson even affirmed that he didn’t know what he actually used. Mariusz Wach cared only about trainings and proper diets. As for supplements, they were chosen and provided by his trainers. Mariusz Wach trusted his trainers entirely. Mariusz Wach didn’t even ask which dietary supplements were taken by him. The boxer decided to put the whole responsibility linked with supplements on his trainers and he was not interested in the nature of products which were given by his trainers.
Mariusz Wach didn’t try to accuse his trainers of his steroid positive. He only disclosed the reality.
Thus, it is possible to suggest that Mariusz Wach has administered a contaminated dietary supplement. You know, it happens quite frequently that athletes use dietary supplements that turn out to contain steroidal compounds. So, problems start.
If Mariusz Wach’s B-sample indicates that the boxer has applied forbidden products, he will be probably suspended for one year. He will be also sentenced to pay a fine.