Homeland Security Presidential Directive 10 (HSPD-10): Biodefense for the 21st Century (Apr. 28, 2004) (full-text).
HSPD 10 outlines the policy for biodefense in the 21st Century. The United States has pursued aggressively a broad range of programs and capabilities to confront the biological weapons threat. The results of a comprehensive study of our capabilities provide a blueprint for our future biodefense program that fully integrates the sustained efforts of the national and homeland security, medical, public health, intelligence, diplomatic, and law enforcement communities. The pillars of this national biodefense program are Threat Awareness, Prevention and Protection, Surveillance and Detection, and Response and Recovery. A classified version of this directive contains specific direction to departments and agencies.
HSPD-10 states that the United States requires a periodic assessment that identifies gaps or vulnerabilities in our biodefense capabilities — of which surveillance and detection is a key part — to guide prioritization of federal investments.