ok this is out of hightimes:::
your carry on luggage will be scanned with X-raytechnology that will show a silhouette of its contents. it may also be subjected to a computer tomography (CT) scanner. CT scanners create a detailed view of the scanned object. the mass and density of objects in your luggage are projected on a screen. the machine is slow and a small percentage of carry on luggage is scanned. several things will prompt a search, such as paying for tickets in cash or purchasing a 1 way ticket. a new finely tuned infrared camera is used in some airports to spot passengers who are sweating or who show a slight temperature. authorities assume a raised temperature shows sickness (such as SARS) or nervousness due to unlawfull activity.
the above devices cannot detect odor, but ion mobility spectrometry (IMS) technology can detect explosive and drug particles down to parts per trillion. according to securiety sources, the machines can tell if you touched drugs DAYS before. a piece of cotton is rubbed across your person and belongings. the ionic particles are then analyzed. I have been strip searched at US airports for testing positive in this way.
Smell is the main problem. drug dogs are often employed to check international travelers entering the US. dogs also sniff luggage behind closed doors on both domestic and international flights.
remember, these guys know all the tricks, and the penalties can be heavy. before u do anything ask yourself: is it worth it? the crotch is the last place theyll check but thats not to say they wont check it. often people stuff their stash in the checked luggage. others send it in the mail to have it waiting for them when they arrive.
this isnt me, its an answer to a question in hightimes that i thought meight be helpfull so hope this helps
peace n bagz
kronik