AKA the drug test, that he knew was coming months in advance. He claims that his failure resulted from a diluted sample because he drank too much water before hand. The problem with that logic is that players are told not to over-hydrate for exactly that reason - it makes it look like you're trying to flush PEDs or weed out of your system.
In general, NFL GMs care less about weed and more about your ability to stay on the field and avoid tests that check for it. If you failed with advance warning, and then it got to your head and you got in a shouting match with a nurse, you probably tanked your stock. The rumor mill is now spinning out day 2 grades for Foster, comparing the case to Randy Gregory, and it's hard to argue that Foster isn't shaping up the same way Gregory did.
Now, basically every fan on earth is hoping that they pull a Joe Mixon - Randy Gregory and get a first round talent on day 2. In reality, this logic almost never works out. If Foster is REALLY a top 5 talent, he won't fall to round 2. Same for Mixon and Sidney Jones, in my opinion. If they end up there, it's because there are better players at that position who don't have red flags. If I'm Tennessee looking at Reuben Foster in round 3, I'd think long and hard before pulling the trigger.
"This country stands for freedom, liberty and justice for all, but it's not happening for all right now." - Kaep