Employers should ensure that their drug-testing programs conform to three of the following guidelines. Which is not a guideline to which employers should ensure their drug-testing programs conform?

Employers should ensure that their drug-testing programs conform to three of the following guidelines. Which is not a guideline to which employers should ensure their drug-testing programs conform?
A. The testing should be conducted in an environment that isn’t intrusive and allows for strict confidentiality of results.
C. The employer should use drug testing for jobs that involve safety hazards.
D. The testing should be routinely administered to all technical and managerial functions across the organization.