Technical means of verification, including space-based sensors that can scan large parts of the world, can provide early warning of long-range missile development. Space-based Staring Infrared Sensors can detect the heat of rocket launching motors. Various radars can monitor range and other characteristics, but they need to be in a place where they have line-of-sight to the missile trajectory. The United States, probably Russia, and possibly other nations have aircraft-based and ship-based sensors that can monitor such tests, but there has to be warning of potential tests so these sensors can be deployed.
IMMIGRATION AND CUSTOMS ENFORCEMENT, HOMELAND SECURITY INVESTIGATIONS TAKES LEAD ON COUNTER-PROLIFERATION INVESTIGATIONS
Jan 07, 2012; CHARLOTTE, N. C., Jan. 5 -- The U. S. Department of Homeland Security's U. S. Immigration and Customs Enforcement issued the...