Section 21-315 - Excuse from service; investigationA. If the jury commissioner or jury manager determines that a person has valid grounds to be excused or postponed from jury service, the person shall be notified accordingly.B. The presiding judge may issue an order or the jury commissioner or jury manager may issue a subpoena for any person whose name appears on the master jury list to appear before the jury commissioner or the jury manager to testify under oath or affirmation concerning the person's qualifications, any grounds for excuse or the completion of an unreturned questionnaire.