You’re leaving out the fact that he had a TUE for adderall. He didn’t fail for anabolic steroids and MLB had a confusing policy.
Beyond that weakness in the policy is that the JDA classifies stimulants as a separate category apart from "Performance Enhancing Substances," a definition it limits to anabolic androgenic steroids and agents (including hormones) with anti-estrogenic activity.
https://www.google.com/amp/s/www.si.com/.amp/mlb/2014/09/12/chris-davis-suspension-orioles-adderall-mlb-drug-policy
That said, I was miffed he wasn’t diligent in having it renewed and missed the playoffs.
Also, a few of y’all in this thread are forgetting the ST just last year when he said he was focusing more on lifting and came into camp noticeably bigger than the three previous seasons. Yes, it was only ST, but the board was buzzing with a “what if” attitude if he could continue into season the way he had looked last spring before play was halted.