Except as provided in section 1865 of this title
or in any jury selection plan provision adopted pursuant to paragraph (5) or (6) of section 1863(b) of this title
, no person or class of persons shall be disqualified, excluded, excused, or exempt from service as jurors: Provided
, That any person summoned for jury service may be (1) excused by the court, or by the clerk under supervision of the court if the court’s jury selection plan so authorizes, upon a showing of undue hardship or extreme inconvenience, for such period as the court deems necessary, at the conclusion of which such person either shall be summoned again for jury service under subsections (b) and (c) of this section or, if the court’s jury selection plan so provides, the name of such person shall be reinserted into the qualified jury wheel for selection pursuant to subsection (a) of this section, or (2) excluded by the court on the ground that such person may be unable to render impartial jury service or that his service as a juror would be likely to disrupt the proceedings, or (3) excluded upon peremptory challenge as provided by law, or (4) excluded pursuant to the procedure specified by law upon a challenge by any party for good cause shown, or (5) excluded upon determination by the court that his service as a juror would be likely to threaten the secrecy of the proceedings, or otherwise adversely affect the integrity of jury deliberations. No person shall be excluded under clause (5) of this subsection unless the judge, in open court, determines that such is warranted and that exclusion of the person will not be inconsistent with sections 1861 and 1862 of this title. The number of persons excluded under clause (5) of this subsection shall not exceed one per centum of the number of persons who return executed jury qualification forms during the period, specified in the plan, between two consecutive fillings of the master jury wheel. The names of persons excluded under clause (5) of this subsection, together with detailed explanations for the exclusions, shall be forwarded immediately to the judicial council of the circuit, which shall have the power to make any appropriate order, prospective or retroactive, to redress any misapplication of clause (5) of this subsection, but otherwise exclusions effectuated under such clause shall not be subject to challenge under the provisions of this title. Any person excluded from a particular jury under clause (2), (3), or (4) of this subsection shall be eligible to sit on another jury if the basis for his initial exclusion would not be relevant to his ability to serve on such other jury.