I was never a fan of Dick Cheney's one percent doctrine.

According to Ron Suskind, after 9/11 Cheney explained to law enforcement and intelligence officials that they should treat even the one percent chance of a terrorist attack as a mathematical certainty. The particular case was of a Pakistani nuclear scientist helping al-Qaeda to acquire a nuclear bomb, but the standard became a shorthand for U.S. counterterror efforts generally. No scale of effort would be too great. Better to chase down 100 leads, 99 of which turn out to be bogus, because finding just that one nugget would have been worth the level of effort.

Now we have evidence that the federal government is chasing down far more than 99 blind alleys for just one lead. From today's front-page story in the New York Times, Eric Schmitt explains how the FBI has adapted and evolved since 9/11:

The bureau now ranks fighting terrorism as its No. 1 priority. It has doubled the number of agents assigned to counterterrorism duties to roughly 5,000 people, and has created new squads across the country that focus more on deterring and disrupting terrorism than on solving crimes.

But the manpower costs of this focus are steep, and the benefits not always clear. Of the 5,500 leads that the squad has pursued since it was formed five years ago, only 5 percent have been found credible enough to be sent to permanent F.B.I. squads for longer-term investigations, said Supervisory Special Agent Kristen von KleinSmid, head of the squad. Only a handful of those cases have resulted in criminal prosecutions or other law enforcement action, and none have foiled a specific terrorist plot, the authorities acknowledge. (Emphasis mine.)

So, just to review:

• 5,500 leads over 5 years
• 5 percent deemed credible
• "A handful" technically would mean five or less, but charitably might total a few dozen. Still, that translates to far less than 1 percent of leads investigated resulting in a criminal prosecution.

But, and here's the kicker,

• None -- zero, zip, nada -- foiled a specific terrorist plot.

On the face of it, this seems like a waste of time and resources that should be spent elsewhere.

There are several plausible explanations, however, for why I'm wrong and why those who believe that we are not dedicating sufficient resources to combating terrorism are right.

• Perhaps other government agencies have been far more effective at disrupting terror plots. (But when the relative comparison is zero, it isn't very hard to clear that bar.)
• Perhaps Schmitt got his facts wrong. (Doubtful. He is one of the most experienced and reliable reporters on the beat.)
• Perhaps the knowledge that 5,000 people chasing down 5,500 leads deters would-be terrorists from even attempting anything. (Or it could simply be helping bin Laden's plan "to make America bleed profusely to the point of bankruptcy.")

Two other points bear consideration. First, it is possible that arresting, prosecuting and convicting people of lesser crimes disrupts what might someday become a full-scale terror plot. There is no reason to think that the guy trying to cut down the Brooklyn Bridge with a blowtorch was much smarter than the 15 guys who provided the muscle for the 9/11 attacks. The difference was leadership, which defined a plausible terrorist attack and devised the means to carry it out. That said, there are problems associated with the expansion of federal laws, and the growing power of prosecutors, and I would still much prefer that common criminals be handled in a run-of-the-mill fashion. Local cops, local prosecutors, local jails.

Which leads to the second point. Reflecting the growing federalization of the criminal law, the FBI strayed into a number of areas even before 9/11 that should have been handled by local law enforcement. This expansion of the federal criminal law poses a threat to individual liberty. (Thanks to Tim Lynch for pointing to this source.) But counterterrorism is one of the few legitimate functions for a federal law enforcement agency, and if the FBI is devoting more resources to that than to other crimes, that in and of itself wouldn't be a bad thing.

I remain unconvinced, however, that what we are seeing is a wise expenditure of resources. And while I understand that zero terrorist plots uncovered is not equal to zero threat of a future attack, it is incumbent on the FBI -- and more generally those who think that the problem is too little, as opposed to much, being devoted to counterterrorism -- to prove why they need still more resources.

Until that occurs, I think that UCLA's Amy Zegart, who is quoted in the Times story, should get the last word on this point:

Just chasing leads burns through resources. ... You’re really going to get bang for the buck when you chase leads based on a deeper assessment of who threatens us, their capabilities and indicators of impending attack. Right now, there’s more chasing than assessing.