What is the required minimum percentage of a unit's personnel that must be tested for drugs annually?

The required minimum percentage of a unit's personnel that must be tested for drugs annually is 10%. This percentage is established to ensure a standard level of accountability and to deter drug use within military units. By testing 10% of personnel each year, the military promotes a drug-free environment and reinforces that substance abuse is taken seriously. This approach also allows for ongoing monitoring and support for personnel, contributing to overall readiness and discipline within the ranks.

Other choices reflect varying standards that might exist in other contexts but do not align with the military's established procedures for drug testing. The policy is designed to provide a regular and consistent framework for testing across all units, ensuring compliance and maintaining operational integrity.