CHEMICAL, BIOLOGICAL, RADIOLOGICAL, NUCLEAR, AN EXPLOSIVE (CBRNE) THREATS TO THE U.S. HOMELAND

Describe an historical (1984-2015) WMD/CBRN attack (e.g., biological or chemical incidences that have occurred in the past 30 years.
Explain a remediation strategy if your selected event had occurred/did occur in the U.S.  Include in your response cost, time, risk communication, public perception.