HOWTO Commit Corporate Espionage
bart_scriv writes "Worried about who might be spying at your company? Businessweek looks at the latest in espionage gadgets and technology in response to the recent HP boardroom scandal. The article looks at devices designed for counter-espionage, which range from mundane confidential email services to sophisticated camera and listening-device detectors. '...for every method of spying, there's a counteroffensive. One of them is the eavesdropping protection kit, manufactured by Dynasound in Norcross, Ga. To secure a room in an office building, devices are placed on ceiling plenums, floors, HVAC ducts, doors, walls or windows — basically anywhere voices can travel.'"
Note that corporate espionage for the purpose of uncovering Trade Secrets is generally illegal in the U.S. That's why companies mark documents as "proprietary," for instance; doing so identifies the document as something that the company considers a trade secret. If you use corporate espionage techniques to obtain such a document (i.e., if the company doesn't exercise due diligence in making sure that such documents aren't publicly disclosed) then relevant Trade Secret laws would apply.
http://en.wikipedia.org/wiki/Trade_secret
I hope that after I die the one word people use to describe me is "resurrected."