; staff of Federal agencies (a) Experts The Commission may procure temporary and intermittent services under section 3109(b) of title 5, United States Code, but at rates for individuals not to exceed the daily equivalent of the annual rate of basic pay for GS–15 of the General Schedule. The services of an expert or consultant may be procured without compensation if the expert or consultant agrees to such an arrangement, in writing, in advance. (b) Staff of Federal agencies Upon request of the Commission, the head of any Federal department or agency may detail, on a reimbursable basis, any of the personnel of that department or agency to the Commission to assist it in carrying out its duties under this Act. 7. Powers of Commission (a) Hearings and sessions The Commission may, for the purpose of carrying out this Act, hold hearings, sit and act at times and places, take testimony, and receive evidence as the Commission considers appropriate. The Commission may administer oaths or affirmations to witnesses appearing before it. (b) Powers of members and agents Any member or agent of the Commission may, if authorized by the Commission, take any action which the Commission is authorized to take by this section. (c) Obtaining official data The Commission may secure directly from any department or agency of the United States information necessary to enable it to carry out this Act. Upon joint request of the Chairperson and Vice Chairperson of the Commission, the head of that department or agency shall furnish that information to the Commission. (d) Subpoena power (1) In general The Commission may issue subpoenas requiring the attendance and testimony of witnesses and the production of any evidence relating to any matter which the Commission is empowered to investigate under this Act. Such subpoenas shall be issued by agreement between the Chairperson and Vice Chairperson of the Commission, or by the vote of a majority of the members of the Commission. The attendance of witnesses and the production of evidence may be