Will you be hearing back from the job itself? Because Concentra doesn't usually contact you to tell you the results, they send them to the company you applied with. When I didn't pass the first one because it was diluted it was the company I applied with who called me, not the lab.

Also, I've always heard the golden rule that no news is good news. Because if you think about it companies assume the people they hire are clean and thus wouldn't think to call and say you passed. It should just be understood that you did. Which makes sense to me.

It probably wouldn't hurt to call Concentra tomorrow though, I just wouldn't call the company you applied with as that would be suspicious. I wish you the best of luck!