As Benjamin Wittes sees it, every person’s life is a “mosaic” of digital information stored on public and private computer servers around the world. However, as a society, we have yet to write coherent or sensible rules governing either a person’s own mosaic or the super-mosaic. In this paper, Wittes, along with Wells Bennett and Rabea Benhalim, addresses a fundamental problem of regulating the mosaic: the government investigators’ access to individuals’ personal data stored in the hands of third parties.