Nice To See The Good Guys Smiling

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Got 'im. Signs we will prevail: rejoicing over this news in the streets of Baghdad; the fact that Sunni informants told the Iraqi police where he was --a triumph for them and an indicator of their abilities. One thing I would like to know:
Casey said Zarqawi's identity was confirmed by "fingerprint verification, facial recognition and known scars."

How does it happen that we always have bad guys' fingerprints on file?

UPDATE: Omar in Iraq has a few more details.