1. Does Quest Diagnostics send the specimens off-site, or do they perform the preliminary drug screening in their lab?
If this was truly a DOT test, you wouldve witnessed the collector:

- Split the sample 30/15 (in bottles with your initials on them).

- Bagged, tagged specimen to be sent off to a facility for analysis.

Under the DOT regs, the collector has to perform these functions in your view. With that being pointed out, you have the answer to your question.