Major League Baseball has worked very hard to rid the game of performing enhancing drugs, and the ugly shadow that hung over the game during the “steroid era”. As a result, the rules have been significantly tightened up, and slowly but surely it seems like things are getting better in that regard.
Unfortunately there are still suspensions though, and it’s happened a lot more in the minor leagues than it has with big leaguers. The rules are slightly different, but regardless, the system shouldn’t be a lot different. The players are provided with a list of banned substances, and they’re expected to make sure they don’t compromise their bodies or the tests that could be taken at random.