What is the main reason for conducting background investigations in security?

The primary reason for conducting background investigations in security is to ensure personnel are eligible for security clearance. This process is crucial because individuals who have access to classified information need to be trustworthy and reliable. Background investigations evaluate a person's history, character, and conduct to determine whether they pose a risk to national security or the integrity of sensitive information.

By assessing factors such as criminal history, financial stability, and previous employment, investigators can make informed decisions about a candidate’s suitability for a security clearance. This step is essential in protecting sensitive data and ensuring that only qualified individuals have access to classified material. While other options may touch on aspects of employee management, they do not align with the core objective of background investigations in the context of security.