Although... it's not certain. I've never been tested without a prior warning.

I have - three times... been told I would have to test and then didn't actually have to. I guess that's a 'psychological' drug test, lol

I'd say - if the job's important enough to you - carry some QF in your glove box or somewhere you can get to in a reasonable amount of time. Heck even your pocket, you'd just have to move it prior to going into the testing facility.

I consider QF 'Insurance'. And at minor cost really. and at that rate, in less than a day's work, you'll cover the quick fix, shipping, and MOST certainly the peace of mind.