Which is a guideline for protecting against possible secondary devices?

Managing the scene with cordons, boundaries, and scene control zones is essential for protecting against possible secondary devices. This approach establishes clear perimeters that help control access to the incident area and keep unauthorized individuals away from potential hazards. By defining specific zones, such as hot, warm, and cold zones, responders can effectively minimize the risk of secondary devices interfering with rescue or response operations.

Having established boundaries also aids in coordinating the efforts of various emergency services and ensures that proper safety protocols are followed. This organizational strategy creates a safer environment for both responders and bystanders by reducing the likelihood of exposure to additional threats that could arise from secondary devices.

The other options, while important to emergency response, do not provide the same level of preventive measures against secondary devices. For example, checking for secondary devices after moving into the incident area does not proactively prevent threats. Similarly, moving suspicious items or engaging personnel may not adequately address the need for a structured approach to scene management and safety.