8 CFR § 341.3
Depositions
November 5, 2020
If satisfied that a witness whose testimony is essential is not available for examination in the United States, the assigned officer may authorize the taking of a deposition abroad by written interrogatories beforea DHS or Department of State official.
[30 FR 5472, Apr. 16, 1965, as amended at 76 FR 53804, Aug. 29, 2011]