Which agency is primarily responsible for WMD response along with FEMA?

The Federal Bureau of Investigation (FBI) is primarily responsible for responding to incidents involving weapons of mass destruction (WMD), alongside the Federal Emergency Management Agency (FEMA). This is because the FBI has a specialized role in domestic counter-terrorism and criminal investigations that encompass threats related to WMDs, such as chemical, biological, radiological, and nuclear weapons. Their national security and intelligence capabilities allow the FBI to coordinate effectively with other agencies during critical responses to such threats.

FEMA, while being focused on disaster management and response, collaborates with the FBI to ensure that any threat involving WMDs is handled comprehensively. The FBI's law enforcement powers and expertise in criminal behavior are essential in addressing the security aspects of WMD incidents, making it a key player in the overall response alongside FEMA. Other agencies listed do have their areas of focus—such as the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) on firearms and explosives, the Drug Enforcement Administration (DEA) on drug-related crime, and the National Security Agency (NSA) on signals intelligence—but they do not have the same direct responsibility for WMD response as the FBI does.