If you are clean, you can take a random test any day of the week, any month of the year. There's no problem. Come knock the door whenever you feel like it.
Because, if you are clean, you can pass any and all tests.
To say he has passed tests before has zero meaning. Scheduled tests are IQ tests. If you fail a scheduled test, you're an idiot. It's like the Olympic games when IOC brags about how many tens of thousands of tests they're going to do in the games. It doesn't mean anything, because you don't go into the games pissing red hot. You've cycled leading up to the games, and now you're well-prepared and ready.
Wanderlei is met with a random test, and all of a sudden he has problems, and has to go. As a professional, if it was the case that he felt like having a lawyer present before taking the test, then why didn't he call the lawyer and ask for the NSAC official to wait. Surely that would've been feasible? But instead, he has an excuse that Barao is fighting so he has to watch an MMA fight instead. This is about his career and profession - surely entertainment takes the backseat then, yes? Also now he's returning back to Brazil, but you guys, wait, I'll be back later after my trip home, then I can test and then I promise you, I'll pass the test!
So, Wanderlei won't fight Chael, and instead will have to deal with the NSAC and a possible suspension.