The core assertion that the U.S. Senate adopted a measure banning its members and aides from participating in prediction markets is fully confirmed by five independent Tier 4 sources and one Tier 6 source, all reporting on the April 30, 2026 unanimous voice vote on S. Res. 708. The three key elements of the claim are each independently confirmed: the Senate "adopted a measure," confirmed as a resolution amending Senate standing rules, a precise and accurate characterization; the ban covers "members and their aides," confirmed, with the staff coverage explicitly added by a Padilla amendment; and the subject is "prediction markets," confirmed. The qualifier "booming" in the broadcast is an editorial descriptor that does not constitute a falsifiable factual predicate and does not affect the verdict. No correction, retraction, or conflicting report was identified in any source. The claim was aired on May 7, 2026, seven days after the vote. All minimum source requirements for TRUE are satisfied with multiple independent Tier 4+ sources.