Single Judge Application; Geib, 733 F.3d at 1354 (establishing that “applicable regulations place responsibility for the ultimate TDIU determination on the VA, not a medical examiner”); Board was therefore prohibited from characterizing their silence on the issue as substantive evidence against entitlement to TDIU; AZ v. Shinseki, 731 F.3d 1303, 1317 (Fed. Cir. 2013) (holding that “where a condition would not normally have been recorded, the Board may not consider the absence of [administrative record] evidence as substantive negative evidence of that condition.”); “[T]he absence of evidence on a particular question cannot be construed as negative evidence against a claimant unless there is a foundation in the record that demonstrates that such silence has a tendency to prove or disprove a relevant fact.” Delrio, 32 Vet.App. at 240 (citing Fountain v. McDonald, 27 Vet.App. 258, 272 (2015));