Nadezya Ostapchuk didn’t administer any banned product intentionally

The Belarusian shot putter Nadezya Ostapchuk won the gold medal at the 2012 Summer Olympics. But she failed a drug test. As a result, she was stripped of the medal which was given to Valeria Adams of New Zealand.
Two tests manifested that a steroid’s metabolites presented in her urine samples.
If a sportsperson is caught using any forbidden medications, he/she is commonly sentenced to a suspension of two years. As for Nadezya Ostapchuk, she received one-year suspension. Why was the sentence lighter? There were several circumstances that proved the following condition: Nadezya Ostapchuk didn’t take any forbidden medication intentionally.
At the beginning the Belarusian shot putter blamed his former coach. She claimed that he had sabotaged her sample.
The Belarusian National Anti-Doping Agency investigated this case. The International Association of Athletic Federation assisted the investigation. It was found out that Yefimov was guilty. This person put powder of methenolone into food of Nadezya Ostapchuk during the last week before the 2012 Olympics. The coach reported that he had worried about Nadezya Ostapchuk. He thought that this steroid would help to win.
Actually, it is difficult to define why Yefimov has done it. He only caused the problem.
Anti-doping officials accepted these affirmations. That’s why the Belarusian shot putter received just one-year suspension.
As for supporters of Valeria Adams, they didn’t believe that the Belarusian shot putter had not used the steroid knowingly. They claimed that Yefimov just tried to protect Nadezya Ostapchuk. They said that the Belarusian shot putter had taken steroids under recommendations of her coach.
If the Belarusian shot putter’s performance was amazing several months before the 2012 London Olympics, her trainer had to be sure that she would win. Why did he worry about her performance?