In my experience I was notified of the UA for my new job within the paperwork of my offer. It came with the official "tentative" offer along with instructions and locations of where I could go. I did have a heads up so I stopped smoking about 5 days prior to receiving their offer. Also I was lucky in that I did not have a tight time frame to take my UA only "sometime before my start date" whixh is today, I took my UA 3 days ago, received my offer about 2 1/2 wks ago.

Just be ready and have a plan such as dillution or subbing, it will be a pre employment screen if any and they are unsupervised. See my thread where I describe my experience at Quest Diagnostics. Also can't recommend enough to take some at home tests so you know if you areat or below the cutoff.

P.S. if you decline to take the screen, its usually an option, it pretty much equals a fail to the Co.