One more thing - a question that Ive overlooked:

I worry, though, that since I failed it, I will be watched during the next one. Any thoughts?
It is entirely possible that this can occur, so be prepared.

As an example, in employment DOT situations, if an employee's U/A has been confirmed THC-positive, DOT regulations mandate that the followup/return to duty test would be conducted under D/O after the employee had completed the SAP process as required by the Agency.