I Took a drug test today as part of pre employment at USS. They

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I Took a drug test today as part of pre employment at USS. They required a hair test, and the lady measured 1 spot on my head and said it was .2cm off. I know for a fact that i have hair that is the required legnth, she was just short, and/or lazy, plus i was nervous and beta. So an under arm sample was taken. I know that the cut off is 90 days for employment here, (on a normal head hair sample, the lab will cut it down to 1.5 inches before doing the test, which gives 3 months). And ive been good for at least that long, if not 120 days. Ive also seen alot about how armpit hair hasnt had that much study and could potentially read out to 4-5 months if not longer... so im Freaking out because i cant remember the last time i smoked. I just know that for certain, it was at the very least 90 days ago, if not weeks more. And when i did smoke, i would take like 2-4 puffs every other day (plus im skinny and sweat almost half a gallon at work every day).... so that aside

TLDR:
What does this mean? I cant find anything on the web about it. The test was done by psychemedics and i have this code for the test... i see that "501 HAIR H: AM CO OPOM" was checked. Does that mean that they wont look for cannabis (CB or THC)?
It sounds like they are looking fod amphetamine, cocaine, and opiates... of course this is only a carbon copy, so could that 'CO' actually be a 'CB'?