Is it really worth giving up your right to privacy for this?

Here's just how effective the Bush Administration's warrantless spying program has been:

Intelligence officers who eavesdropped on thousands of Americans in overseas calls under authority from President Bush have dismissed nearly all of them as potential suspects after hearing nothing pertinent to a terrorist threat, according to accounts from current and former government officials and private-sector sources with knowledge of the technologies in use.

Bush has recently described the warrantless operation as "terrorist surveillance" and summed it up by declaring that "if you're talking to a member of al Qaeda, we want to know why." But officials conversant with the program said a far more common question for eavesdroppers is whether, not why, a terrorist plotter is on either end of the call. The answer, they said, is usually no.

Fewer than 10 U.S. citizens or residents a year, according to an authoritative account, have aroused enough suspicion during warrantless eavesdropping to justify interception of their domestic calls, as well. That step still requires a warrant from a federal judge, for which the government must supply evidence of probable cause.

The Bush administration refuses to say -- in public or in closed session of Congress -- how many Americans in the past four years have had their conversations recorded or their e-mails read by intelligence analysts without court authority. Two knowledgeable sources placed that number in the thousands; one of them, more specific, said about 5,000.

The program has touched many more Americans than that. Surveillance takes place in several stages, officials said, the earliest by machine. Computer-controlled systems collect and sift basic information about hundreds of thousands of faxes, e-mails and telephone calls into and out of the United States before selecting the ones for scrutiny by human eyes and ears.

Successive stages of filtering grow more intrusive as artificial intelligence systems rank voice and data traffic in order of likeliest interest to human analysts. But intelligence officers, who test the computer judgments by listening initially to brief fragments of conversation, "wash out" most of the leads within days or weeks.

The scale of warrantless surveillance, and the high proportion of bystanders swept in, sheds new light on Bush's circumvention of the courts. National security lawyers, in and out of government, said the washout rate raised fresh doubts about the program's lawfulness under the Fourth Amendment, because a search cannot be judged "reasonable" if it is based on evidence that experience shows to be unreliable. Other officials said the disclosures might shift the terms of public debate, altering perceptions about the balance between privacy lost and security gained.

Air Force Gen. Michael V. Hayden, the nation's second-ranking intelligence officer, acknowledged in a news briefing last month that eavesdroppers "have to go down some blind alleys to find the tips that pay off." Other officials, nearly all of whom spoke on the condition of anonymity because they are not permitted to discuss the program, said the prevalence of false leads is especially pronounced when U.S. citizens or residents are surveilled. No intelligence agency, they said, believes that "terrorist . . . operatives inside our country," as Bush described the surveillance targets, number anywhere near the thousands who have been subject to eavesdropping.

Some might argue, even though I would dispute their argument, that the Bush plan is necessary "because the Bill of Rights is not a suicide pact." But when it's this clear that the plan is both unconstitutional AND ineffective, it becomes impossible to justify on national security grounds.

So it's time for the Bush Administration to come clean and admit that its program is about identifying Americans who oppose its policies, NOT about keeping anyone safe from terrorists.