How so? An athlete is still responsible for what he/she puts into their body. Taking a prescription medicine doesn't absolve Braun since MLB has procedures in place for medical exemptions.
Exactly, I take a prescribed amphetamine every morning (Concerta) for ADD which, if not for medical exemptions, would flag me ever time I had to do a drug test. I don't buy that it was the medication that caused it, I would buy that it was a medical condition though.