David, this should be an interesting and worthwhile line of study that potentially could increase the effectiveness of our unofficial civilian surveillance methods (meaning civilians looking for suspicious activity, not law enforcement intruding in civilian lives without just cause). Our public (in the U.S.) is sensitized to varying degrees to detect suspicious behavior, yet that could still be enhanced through public awareness programs (training for detecting both terrorist and criminal pre-execution behaviors). Although much improved since 9/11, our biggest challenge seems to be law enforcement's ability to receive these reports and fuse these reports in a common database (that local, state and federal can all access), and then have enough trained analysts to connect the dots. Fortunately, when want to be terrorists are dumb enough to buy certain materials and ask questions that makes the hair on the back of your neck raise, that is normally enough to prompt local law enforcement to investigate. For terrorists and criminals that are more sophisticated, like the 9/11 terrorists, the key is connecting the fuzzy dots.
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