Would you be able to weigh in on storage? With us as roommates, it seems less imperative- but I can't remember if a pre-employment style drug test is "You have 45 minutes to get there and be ready to present your sample" (at which point I better have some on hand on all the time!) or if it's "Take this test within the next three days and get the slip back to us" (to which I can take some time).
If a urine sample is not used within an 8 hour period, it should be chilled or frozen. As far as storage life, the answers are found by utilizing the Search button.
And do OTC Drug Screens have the same cut-off levels that the immunoassay would (checked Quest's website and their 10-panel will be immunoassay followed by GC/MS as needed)? I found a 10-Panel Cup through Wal-Mart that I was thinking of testing my subs with before the test (better safe than sorry), and that would also allow me to check and see if the girlfriend's prescription is cleared out if I do need to use hers for any reason.
Most home test utilize a 50 ng cutoff for THC, which is the same as most assays used for the initial screening at the lab. As far as the other panels, theres no telling. And any further discussion gets into an area of off-topic drugs which is prohibited, as per the Board Rules.