[George from New England]

Most computers will store the last week or twos worth of browsing as well as all the image files that are viewed. This is simple police work to find these items; no great hacking skills are required.

[Ratatoskr]

Most computers will store the last week or twos worth of browsing as well as all the image files that are viewed.

That's not what the article implies. They didn't know who he was; they found him by working backwards from Expedia. That's a whole lot different from having a suspect and verifying he'd downloaded a map by looking at his cache.