Authorization during emergencies

Notwithstanding any other provision of this subchapter, when the Attorney General makes a determination described in subsection (b), the Attorney General may authorize the installation and use of a pen register or trap and trace device on an emergency basis to gather foreign intelligence information not concerning a United States person or information to protect against international terrorism or clandestine intelligence activities, provided that such investigation of a United States person is not conducted solely upon the basis of activities protected by the first amendment to the Constitution if— A determination under this subsection is a reasonable determination by the Attorney General that— In the absence of an order applied for under subsection (a)(2) approving the installation and use of a pen register or trap and trace device authorized under this section, the installation and use of the pen register or trap and trace device, as the case may be, shall terminate at the earlier of— Information collected through the use of a pen register or trap and trace device installed under this section shall be subject to the policies and procedures required under section 1842(h) of this title.