Chief Justice is Q-13, Highest Clearance Code for the US Department of Energy (TeslaLeaks.com)

A: Under the reciprocity guidelines, a Q is the equivalent of a Top Secret. The investigation required for a Q is the same as the one required for a Top Secret, and with a Q an individual can be given access to Top Secret National Security Information if his or her duties require it. https://en.wikipedia.org/wiki/Q_clearance