The CJA 21 (Voucher for Expert and Other Services) and CJA 31 (Death Penalty Proceedings: Voucher for Expert and Other Services) documents are used for compensating expert service providers. In eVoucher, the attorney is responsible for creating the CJA 21/31 and linking the service provider to the voucher.
Either the attorney or the expert (provided the court has granted the expert access) may complete the CJA 21/31.