I bet they'd bitch about the standard saliva test - which is designed to pick up the active components of drugs rather than the metabolites (as in a urine test) - but is far easier to administer by people without medical training than a blood test.
I see men of the older generation in stores that still at this day and age lick their thumb and count out money, re-lick their thumb and count out a bit more. YUCK
Besides all the deadly germs they are transferring to their mouth what about drug residue?
Just handling money then putting a finger in the mouth can be just as dangerous.
I do not trust the Saliva test for that reason.
As was noted the retina scan and the piss test can be gotten around some how---I worked with people that pass the tests that were heavy users of pot and I was told that coke leaves the system in 4 days.
When the piss test was developed the technology was brand new with problems and it hit the military hard. There were so many false positives that the Mormons who are squeaky clean were getting popped. Put the fear of God into Everyone and there was a huge hue and cry.
I am all for testing but I don't really trust anything but a blood test and that can get screwed up in the lab.
It can be a time of really big trauma when a clean person is fired for a false positive, expensive also as they have to pay for the tests they will need to get to prove they are in fact clean.