So this depends on how strict the testing situation is. For something like a court-ordered test, it's really strict - there's a "chain of custody" thing where they have to document who's had their hands on the sample or some such nonsense. Some employer-mandated tests are like that.

For me, it was pee in a cup and put it through a little window direct to the lab, but no complicated business about it. Lucky, because I could get all the lab work done at my uni health center, where they also have enough of my health records (albeit not the most current Rx's) to know that I've taken Adderall forever and a day.