Has a sober examination of TSA's airport antics and DHS's 9/11 24/7 alerts:
Lessons from the Failed Homeland Security Advisory System
Jacob N. Shapiro and Dara Kay Cohen
The United States’ color-coded Homeland Security Advisory System (HSAS) has failed to motivate relevant actors to take costly protective measures in response to a terrorist alert, particularly after increases in the threat level appeared to be politically manipulated. The HSAS has neither shared relevant information regarding its alerts nor generated enough confidence in the government to convince the public to take necessary actions. An alternative trust-based alert system could succeed where HSAS has failed.
(Full disclosure: I am a reviewer for this Harvard journal )