Well I for one am of the opinion that you should confront any MRO with a solid foundation of knowing what they're up to. I've snagged
my knowledge from lurking on forums dedicated to MRO info. They don't like it when guys like me come around, and they even say that they are against using the info on their
public forums as a means to subvert the drug testing industry.
Thus, I lurk and acquire information, but never contribute because there's no need. In my many hours hanging out with these MD's, I've found they fall into two categories:
1. The type that don't want to see lives disrupted by drug testing. They will listen to explanations for positive results and don't feel good about reporting them. But, of course, it's their job and their concerns are valid when testing truck drivers, airplane pilots, etc. They are skeptical when they send a potential CompUSA employee as positive because who gives a fuck if the guy who's trying to sell you a modem smoked pot over the weekend? The senior mod of a forum I lurk on doesn't even believe that testing for prescription drugs is a good idea because people tend to share prescriptions and he ultimately feels it's a waste of time. Needless to say, I respect and like this individual because he has values that extend beyond generating revenue for an industry...
2. The type who like drug testing as a means of social engineering. These guys are like LEO's in that they don't care if your test is positive for amphetamine because you ingested ephedrine or pseudoephedrine. They exist to validate the drug testing industry that employs them, and will do whatever they can to force an admission of drug use out of you. Don't even cater to them by admitting
anything. Tell them to
prove you are drug-positive by providing a GC/MS confirmation. Ask to see it and demand that they prove your result conforms to the spectra that they compare your results to. Trust me, they will go right on the defensive because your lawyer is waiting for them to fuck up, right?
Basically, these guys will behave as LEO's in that they will try to coerce an admission of drug use based on a preliminary screen--i.e., inconclusive evidence. In my opinion, there's no reason to go on the defensive with them, in fact I would come out swinging and say, "Fine, the preliminary test was positive, but let's see what the GC/MS confirmation says. If it doesn't confirm for whatever you're looking for, go fuck yourself."
Don't let an MRO dictate the course of your life. He needs to back up his results with proof via chemical testing which includes a reliable (and expensive) GC/MS confirmation. He doesn't want to do this because he will have to spend more of his time and more of the company's money.
But
make him do this and act like you know exactly what you're talking about, because if he fucks up you will sue the shit out of him for fucking up your livelihood based on an imprecise preliminary screen.