Does subtext show up in lab drug tests?

No, not on your standard test. They have to specifically test for it seperatly. Most places do 5 panel (thc, cocaine, opiates, barbiturates, amphetimines). Others, like the courts or treatment facilities do a ten panel (all of the above plus pcp, steroids, barbiturates, benzos, mdma). In saying that, more and more places, mainly the courts and some others are starting too ask for the tests, but, my guess is you'll be ok, chances are they won't test for it, so there is a possibility but the odds are in your favor, good luck!