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The FBI has quietly built a sophisticated, point-and-click surveillance system that performs instant wiretaps on almost any communications device, according to nearly a thousand pages of restricted documents newly released under the Freedom of Information Act.

The surveillance system, called DCSNet, for Digital Collection System Network, connects FBI wiretapping rooms to switches controlled by traditional land-line operators, internet-telephony providers and cellular companies. It is far more intricately woven into the nation's telecom infrastructure than observers suspected.

The FBI bit off some controversy in 2000 when it acknowledged it was using a custom packet sniffer called Carnivore to effect court-authorized surveillance of internet traffic.

Some network operators were uncomfortable with g-men barging in their colo to hang a black box off their network, while civil libertarians chaffed at the bureau's legally adventuresome use of some of Carnivore's features with perfunctory court notice instead of a  full-blown wiretap order.

The feds responded by giving the tool a less-ominous moniker, DCS-1000, and getting the law changed. They later put the tool out to pasture in  favor of commercial solutions.