Belarusian medalist was sentenced to one-year ban

Nadezya Ostapchuk, a Belarusian shot putter, received the gold medal at the 2012 Olympic Games. But she failed a drug test. As a result, she lost the medal that was given to Valeria Adams of New Zealand.
Two tests displayed that a steroid’s metabolites presented in her urine samples.
When an athlete is caught using any prohibited products, he/she is usually sentenced to a ban of two years. When it comes to Nadezya Ostapchuk, she received one-year ban. Why was the sentence lighter? There were some circumstances which proved the following condition: the Belarusian shot putter didn’t take any forbidden drug intentionally.
At the beginning the shot putter blamed his former coach. She affirmed that he had sabotaged her sample.
The Belarusian National Anti-Doping Agency investigated this case. The International Association of Athletic Federation also took part in the investigation. It was determined that Yefimov was guilty. This person added powder of methenolone into food of Nadezya Ostapchuk during the last week before the Olympics. The coach claimed that he had worried about the shot putter. He thought that this steroid would help to win.
Actually, it is difficult to define why Yefimov has done it. He just caused the problem.
Anti-doping agencies accepted these arguments. That’s why the Belarusian shot putter received just one-year suspension.
As for supporters of Valeria Adams, they didn’t believe that Nadezya Ostapchuk had not used the steroid intentionally. They said that Yefimov just put efforts to protect Nadezya Ostapchuk. They confirmed that the Belarusian shot putter had taken steroids under recommendations of her coach.
If Nadezya Ostapchuk’s performance was great certain months before the 2012 Summer Olympics, her coach had to be sure that she would win. Why did he trouble about?