Chemical, biological, radiological and nuclear defence (CBRN defence or CBRNE defence) are protective measures taken in situations in which chemical, biological, radiological or nuclear warfare (including terrorism) hazards may be present. CBRN defence consists of CBRN passive protection, contamination avoidance and CBRN mitigation.
This article needs attention from an expert in Military history. The specific problem is: Muddled terminology. (September 2015)
A CBRN incident differs from a hazardous material incident in both scope (i.e., CBRN can be a mass casualty situation) and intent. CBRN incidents are responded to under the assumption that they are intentional and malicious; evidence preservation and perpetrator apprehension are of greater concern than with HAZMAT incidents.
A 2011 forecast concluded that worldwide government spending on CBRN defence products and services would reach US$8.38bn that year.