CFR › Title 5 › Part 831 › §831.11085 CFR §831.1108Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Witnesses shall testify under oath or affirmation and shall be subject to cross-examination.(b)Each party is responsible for securing the attendance of his witnesses. OPM has no power of subpena in these cases.