First off, it's amazing that we even test athletes for marijuana. Steroids, I can understand.
I find it hard to believe that any athlete that smokes a joint could be such a terrible detriment to the sport. I would think an athlete that smokes before they play has smoked before, knows what effect it will have on them, and their ability to perform. If someone knows an athlete that is smoking, handle it in-house, and don't go screaming it to the media.
I think it's all about image...And if that is the case, why keep bringing attention to the sport with this issue.
Peace and happiness