Tech question about results of Google image search for "Abu Ghraib"

Boingboing reader Greg asks,

I find it interesting to note that Google image search doesn't have any of the pics of the Abu Ghraib abuse that are floating everywhere else on the net. A search for "Abu Ghraib" does bring up photos, but none of the ones that we all saw on CNN and in the Wall Street Journal. I had searched there not long after the story broke and found none of them, but I figured it was just too new. Now, after weeks of spidering time, they still aren't there. Anyone have an idea why?

Link

UPDATE: Intrepid BoingBoing reader Andrew says, "I tried the image search at altavista.com (making sure to turn off "family filtering" or whatever) and some of the abuse photos turn up if you hit "next" enough. Strangely, searching for "Abu Ghraib abuse" turns up *nothing* and searching for "Abu Ghraib torture" turns up virtually nothing with images.google.com."

UPDATE 2:
Tim Ireland says, "This happens because Google only updates its image database every 6-12 months. The last update was January 2004, before the publication of these images and their broadcast on the web."