The government’s ability to obtain and analyze recorded information about its citizens through the process known as data mining has expanded enormously over the past decade. Since at least the mid1990s, the quantity of the world’s recorded data has doubled every year. At the same time, the computing power necessary to store, access, and analyze these data has increased geometrically, at increasingly cheaper cost. Governments that want to know about their subjects would be foolish not to take advantage of this situation, and federal and state bodies in this country have done so with alacrity.