Nadezya Ostapchuk’s coach put banned substance into her food

The Belarusian shot putter Nadezya Ostapchuk received the gold medal at the 2012 Summer Olympics. But she failed a drug test. As a result, she lost the medal that was given to Valeria Adams of New Zealand.
Two tests indicated presence of a steroid’s metabolites in her urine samples.
If an athlete is caught taking any banned medicines, he/she is commonly sentenced to a ban of two years. As for this Belarusian shot putter, she received one-year suspension. Why was the sentence lighter? There were certain circumstances which proved the following condition: the shop putter didn’t administer any prohibited product intentionally.
At the beginning the Belarusian shot putter blamed his former coach. She confirmed that he had sabotaged her sample.
The Belarusian National Anti-Doping Agency examined this case. The International Association of Athletic Federation also took part in the investigation. It was found out that Yefimov was guilty. This person added powder of methenolone into food of Nadezya Ostapchuk during the last week before the 2012 Olympic Games. The coach reported that he had worried about Nadezya Ostapchuk. He believed that this steroid would help to win.
In fact, it is difficult to define why Yefimov has done it. He just made the things worse.
Anti-doping officers accepted these statements. That’s why Nadezya Ostapchuk was sentenced just to one-year suspension.
As for supporters of Valeria Adams, they didn’t believe that Nadezya Ostapchuk had not administered the steroid knowingly. They confirmed that Yefimov just tried to protect the shot putter. They said that Nadezya Ostapchuk had taken steroids under recommendations of her coach.
If Nadezya Ostapchuk’s performance was amazing some months before the 2012 Olympics, her coach had to be sure that she would win. Why did he worry about her performance?