We’ve all heard about how people can detect laptops left in cars, even if you keep them out of sight in your car boot. I guess the only way they perform this detection is if they are picking up a unique resonance frequency from a radio circuit on the device. The most widely installed device with such a circuit is your wireless chip (does this mean that old, pre-wifi era laptops are more secure?). I suppose that if you had a tv tuner card or bluetooth, that could provide a resonance frequency as well.
Wifi operates at 2.4 GHz (125mm), so you could probably build one out of standard metal mesh to place your laptop in, making it invisible to RF scanners.
Alternatively, buy a ready-made bag here.
Wata - Malaysian Oil and Gas Engineer 
Interesting. Can they detect the laptop, even if it is turned off?
Soha: I have been told they can, and I think it’s possible. They use the same technique the tv and radio authorities use to track down houses that did not have tv or radio licenses. These items could be detected even though they were powered down.
wow. i watched enemy of the state. now i need to watch the conversation.
‘the conversation’??? don’t get it….but thanks for the info Wata!
interesting….. even with the battery removed?
i thought the car is a faraday cage, as if you get hit by a lightning in the car, you should still be alive.
i need to start going into that business. where can i buy one of those detectors?
Jabba: I believe RTM has a whole heap moldering somewhere, which they used when Malaysians required having a tv license (pre-1999?). As for a car being a faraday cage, it is one as far as a lightning strike is concerned, but it still lets EM waves in.
Hmmm… just curious. Is faraday cage the device used by Wilhelm Reich to discover the bions? the blink blink blue glowy stuff.
(you can find a lot of bions inside Jabba 😛 )
Relax: why do you always ‘slack off’ Jabba?