The conclusion is, its toooo HiTech for this kind of device to exist. The detecting method sounds impossible. Able to differentiate between different types of electronics gadget is simply too hard for for me to belive (maybe cuz i ex engine student also?)

I do believe if there exist devices that can detect certain metal in batteries. And picking up the signal frm your CMOS is too much for this kind of device.

but lucky for me i still stuck with my desktop, so no need for them to use any detector bah. Use your eyes is more than enuf.