re: Well the mystery solved as to why "Key" took a leave from the team

If you have a bit of self control, you can smoke while in the league.

The way I've heard the NFL drug testing explained is this; All players will be tested at some point between March and July. It's random, so you don't know when.

If you pass that, you will not be tested until the next cycle, meaning if you get tested in May and pass, you will not be tested again until at least the next March. So you can smoke to your heart's content afterwards.

If you fail, THEN you're subjected to repeat testing throughout the year. The NFL wants to look the other way. It's the idiots that cannot hold off until the initial random testing that end up being in the drug program.