i just took mine monday with labcorp and i took 3 at home tests. all three had very faint pink lines even the one i took after it. does that mean a pass with them? i mean i could see all the pink lines no matter how faint and the test i took after it was with not drinking after it for 2 and a half hours and it was still visible but pretty faint.
A faint line is still a line, which is a negative.

I was wondering if you show up positive for a prescription, if it would cause them to confirm (re-test at 15 ng/ml on gc/ms) all the drugs that tested negative the the original assay?
Nope. Only the drug(s) that tested positive on the initial assay undergoes the confirmation GC/MS. It would be way too costly and a huge waste of money to run a confirmation test on all the drugs on a given panel.