Surveys are conducted when a CBRN hazard is:

Surveys are essential in CBRN (Chemical, Biological, Radiological, and Nuclear) operations when a hazard is suspected or known. The purpose of a survey is to gather critical data regarding the presence and extent of a potential danger. Conducting a survey under these conditions allows responders to assess the situation effectively, determine the appropriate response measures, and ensure the safety of personnel and the public.

When a CBRN threat is suspected, reconnaissance teams can deploy specialized equipment and techniques to detect and identify hazardous materials. This proactive approach is crucial because it enables timely decision-making and planning for potential decontamination measures, evacuation, or other safety protocols. Moreover, knowledge of a known CBRN hazard allows for focused and targeted responses, minimizing risk and maximizing operational effectiveness.

In contrast, conducting surveys when a hazard is eliminated or nonexistent, hidden or disguised, or visible or obvious may not provide the necessary data and context for a meaningful assessment. Thus, focusing on suspected or known hazards is paramount in ensuring CBRN operations are effective and safe.