As government agencies and law enforcement departments increasingly adopt big-data surveillance technologies as part of their routine investigatory practice, personal information privacy concerns are becoming progressively more palpable. On the other hand, advancing technologies and data-mining potentially offer law enforcement greater ability to detect, investigate, and prosecute criminal activity. These concerns (for personal information privacy and the efficacy of law enforcement) are both very important in contemporary society. On one view, American privacy law has not kept up with advancing technological capabilities, and government agencies have arguably begun to overstep the acceptable boundaries of information access, violating the ...