As spycake stated, the PED suspension doesn't require a drug test necessarily, as seen in the Biogenesis case. Also, there are multiple indicators in the current testing that the MLB uses that could bring about a false positive. The current testing protocols utilized by Major League Baseball were essentially repealed in the mid- to late-1990s by powerlifting due to numerous evidenced false positives by the scientific community around powerlifting. Baseball doesn't want to have their testing challenged in the same way, so you haven't heard about the false positives that these tests can show. Regardless, drinking and driving even after having 1-2 beers over the course of a few hours is still technically impaired driving, yet a whole lot of people do it, and if they get pulled over and are over the legal limit, they're given the opportunity to get their driver's license back and in some states even have a first DUI fall off the record after classes and so many years without a second instance. Why would we want to be more forgiving of someone who quite literally could have killed multiple other people on the road but not to a guy who was attempting to make the most of his ability to earn a tremendous income? Also, one last thing. I suggest reading up on the studies MLB is doing into PED manipulation on the Rule 5 draft. There is actually incentive for teams to have players get suspended for PEDs in some circumstances...