The boyfriend had taken the banned preparations and transferred them in small quantities to girlfriend Fuchs, 32, in connection with sex.
"This has become a big lesson for me and now that this is over I can concentrate on Tokyo," the flyweight boxer (51 kg) writes in a comment.
It was in March that she learned that an unannounced test in February had yielded positive results.
"Should not be considered a violation""While the global anti-doping code does require that this finding should be considered a violation and should be made public, we are convinced that this case and others with contaminated meat and contaminants with prescription drugs should not be considered a violation," writes Usada President Travis Tygart, known for putting cyclist Lance Armstrong there.
The US boxing national team returned to training in Colorado Springs this week for the first time during the corona pandemic.
In a conviction, Fuchs had risked four years of suspension.
CLIP: Here is the legendary viral success (May 20, 2020)
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53-year-old boxing legend Mike Tyson looks more well-tuned than in years. Photo: Mike Tyson's viral super success - has been viewed over 30 million times