How to Tap a Computer

Besides following them, bugging them, wiretapping them and digging through their trash, the FBI got the goods on the alleged CIA mole and his wife by conducting "electronic surveillance of ((Rick)) Ames' personal computer," according to the affidavit. The FBI won't say exactly how it did this, but electronic experts have some intriguing ideas that illustrate the advanced state of computer snooping.

One way to look into a suspect's computer is remote surveillance. Parked just down the block, agents are able to pick up the electromagnetic waves that dance across a suspect's computer screen and convert them back into characters and...

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