Personnel can only re-enter a scene after relinquishing control once they have what?

The correct choice is that personnel can only re-enter a scene after relinquishing control once they have secured permission from the owner. This is important because re-entering a scene, especially one that has been deemed hazardous, requires clear communication and authority. The owner of the property has legal rights to the premises and may need to be informed about the actions taken by emergency personnel.

When the owner grants permission, it not only ensures respect for property rights, but it also establishes a cooperative relationship between the emergency responders and the property owner. This is crucial for maintaining safety and coordination at the scene. It signifies that the risks involved have been properly evaluated and that the owner is aware of the activities being conducted.

While the other options may seem relevant in various contexts, securing permission from the owner is the fundamental step required for re-entering a controlled scene. Conducting a safety assessment is also critical but typically occurs before decisions about re-entry are made. Calling for reinforcements might be necessary under certain circumstances, but it does not directly pertain to the conditions set for re-entry. Notifying the fire chief is an operational protocol but does not replace the necessity of obtaining the owner's consent.