Interesting reading, especially these couple of paragraphs as they relate to what you and I might get up to on a fairly regular basis:
The guidelines stress that "it is not possible to identify a potential assailant on the basis of appearance, nationality or language" but recommend that employees in businesses and other agencies operating in crowded areas be trained in identifying the behaviours of potential terrorists.
These include "continuous scanning of an area, unusual perspiration, heavy breathing, fidgeting, rubbing hands, pacing, clock watching, exaggerated yawning, avoiding security/uniformed officers".
"There are behaviour clues staff can look out for when identifying potential preparatory actions for terrorism or criminal activity: unusual video recording or photography, working in groups, taking notes/drawing diagrams, taking measurements (pacing steps out), avoiding eye contact, asking about security/operations, revisiting the same location, observing but not using a public transport system."
http://www.theage.com.au/federal-politi ... z45g1WE2ol
(emphasis is mine, and based on all my caching behaviours!)
Guess I'll have to start caching by walking directly go GZ, alone, pouring on the anti-perspirant, ignore the time, make sure I get plenty of sleep beforehand, have a friendly chat with anyone in a uniform, keep my hands in my pockets, never going back if I dnf, and avoid rubbing my hands in glee if I find it...