erized as potentially useful, the record clearly shows that evidence has been lost and that the loss is "chargeable to the state," United States v. Rahman, 189 F.3d 88, 139 (quoting Colon v. Kuhlman, 865. F.2d 29, 30 [2d Cir. 1988]), and a hearing, therefore, is required. See, e.g., United States v. So