Geez Karen. I was joking!

Which I am entitled to do after 20 or so years of dealing with drug testing. I have heard every excuse (poppy seeds, spiked punch, spiked pizza, took my daughter's cough medicine, was with granny while she was smoking medicinal marijuana, parties, etc.) With one employer I worked with DOT requirements for drug testing which are more stringent than others - which is what you are referring to with random in-service. Lots and lots of crazy stories with drug testing.

Probably more than 90% of people who "flunk" drug testing are positive for cannabis. With truck drivers it is often amphetamines.

Drug testing always includes a spectrum of drugs. And it has become a big business.

A client I was working with recently - a temporary employment agency - does their OWN drug testing. They have a machine in the office. Applicants "give a sample" and then it is processed through the machine in the office - on the spot so to speak. If they get a positive the applicant is sent to a medical clinic for further testing. Ick. But they cut the cost from $15 per test to a couple of dollars.