What is the burden of producing an extra-judicial statement?

Beyond the necessary demonstration that the extra-judicial statement is trustworthy, there arises a real question, which this case would present, whether the prosecutor bears the additional burden of producing all available declarants upon whose extra-judicial declarations the government intends to rely, or, in the alternative, showing the unavailability of these declarants. ³⁹ Our decision in United States v. Puco, supra, indicates that when the extra-judicial statement is not crucial to the government's case

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