No, it shows that if you can pass a test you can get another chance. Not at all complicated.
It's my opinion that it's what a drug test is for (barring high level clearance). A drug test for a grocery job? It's just a simple test of your intelligence. Can you be smart enough to abstain for a bit....or cheat? If so...yer hired!
Now NFL players with a habit and money...is a bit problematic. I have issues with some substance testing....as this isn't a critical job like doctors, first responders and such. IS it the NFL wants a clean image? Come on! It's really more about being able to control and punish some teams. Some inconsistent application of punishment.