"He added that Google "rewrites" your search history after a year and a half, so that it can no longer be tracked, even under a court mandate." My search histo

"He added that Google "rewrites" your search history after a year and a half, so that it can no longer be tracked, even under a court mandate." My search history on http://google.com/history http://google.com/history goes back to January 2007, which is over three years. Maybe he meant that history entries older than one and a half years will be "rewritten" if you manually went and asked Google to remove them (by using the "Remove Items" function in the history). I wonder how many people are aware of that function.