What are the requirements if a Future Sailor tests positive for THC during the 30-day NIDT?

The correct answer regarding the requirements if a Future Sailor tests positive for THC during the 30-day NIDT is that the Commanding Officer (CO) has the option to retest within 2 hours. This policy reflects the Navy's protocols to ensure fairness and accuracy in testing, acknowledging the possibility of false positives or other considerations that might warrant a second test.

Allowing a retest within this timeframe offers a safeguard for the Future Sailor, ensuring that any initial positive result is corroborated before making definitive decisions regarding their enlistment status. This approach underscores the Navy's commitment to due process and the importance of accurate drug screening.

The implication of the other options indicates a rigid and immediate action that does not align with the established protocols. For instance, immediate discharge may not take into account the nuances of testing, while the possibilities of retesting within longer periods or outright prohibitions do not provide the flexibility that the two-hour retesting window allows.