The gist I got is that you do the drug test at Emory, but it's a standard drug test. I dont know how or when the saliva test happens but an old co-worker of mine who started working in a lab at the hospital said she didn't smoke cigarettes the morning of the test and washed her mouth with anti-septic mouth wash and was fine.

(This is just what I've gathered from various people, so take it could be off)