File:Doj.png

Summary
Quoting the existing image for the DoJ:

This image is a work of a United States Department of Justice employee, taken or made during the course of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

Cropped & converted from http://www.usdoj.gov/criminal/oiafug/doj.gif

Licensing
See restrictions here and at the next section.