Which of the following is NOT the advantage of contract services?

One of the primary drawbacks of using contract security services is the reduction in direct control over the personnel and operations. While contract services offer benefits such as simplified administration, quick staffing solutions, and access to specialized expertise, they limit the organization's ability to directly manage and discipline personnel or tailor services to company-specific policies and culture.

Administration (B), Staffing (C), and Expertise (D) are all advantages of contract services.

Control (A) is a typical advantage of proprietary systems, not contract models.