They could but the window for them to even catch it would be short. We have to test our patients who are on controlled substances a most of the time it isn't even random, we tell them they are due and have 30 days to complete it. We have people testing positive for cocaine when the half life is about 2-3 days so they literally just had to stop for 3 days then go and they can't even manage to do that. Amazed at how many 70+ year olds are snorting powder still.
That's crazy that old people would be that able to withstand the damage it does on your heart, let alone be chronic users. I had a unique experience with surprise drug tests, but I have never heard of anyone else failing a test for coke outside of Jon Jones.
I had a surprise drug test I wasn't expecting once back as a juvenile and bombed it. Turns out that terms of my probation for assault and robbery didn't involve drug testing, so luckily it was completely thrown out in court.
There were some concerns raised from the nature center I was doing community service at about my attitude, hygiene, and some remarks I made about special needs people that were purposely misconstrued as signs of drug abuse. I was 16 shoveling horse shit 8 hours a day. I came in after my part time day shift as a barback, so I was high as fuck in dirty clothes and wore the same worn-out shitty shoes. I called one of the farmhands every name I could think of for mentally handicapped as he was what you could colloquially refer to as an anti-intellectual. Naturally, they didn't like me, and reported me to my PO who told my parents to bring me in to see her.
I didn't know any better so I took the test without question and failed for coke, benzos, opiates, alcohol, and weed. I consumed all of those on the day I was tested, within about 3-4 hours of the sample cup being put in front of me. I was not an emotionally intelligent kid.