IG Subpoena Authority Act This bill grants inspectors general subpoena authority to compel the attendance and testimony of witnesses. Inspectors general may not require by subpoena the attendance and testimony of any current federal employees, but they may use other authorized procedures. To be issued, such a subpoena (1) must be approved by a panel comprised of three inspectors general of the Council of the Inspectors General on Integrity and Efficiency, and (2) must not be objected to by the Department of Justice.