(a) Within the United States. Within the United States or within a territory or insular possession subject to the jurisdiction of the United States, depositions shall be taken before an officer authorized to administer oaths by the laws of the United States or of the place where the examination is held, or before a person appointed by the court in which the action is pending. A person so appointed has power to administer oaths and take testimony. The term "officer" as used in Rules 30, 31, and 32 includes a person appointed by the court or designated by the parties under Rule 29.
(b) In foreign countries. In a foreign country, depositions may be taken (1) on notice before a person authorized to administer oaths in the place in which the examination is held, either by the law thereof or by the law of the United States, or (2) before a person commissioned by the court, and a person so commissioned shall have the power by virtue of his commission to administer any necessary oath and take testimony, or (3) pursuant to a letter rogatory. A commission or a letter rogatory shall be issued on application and notice and on terms that are just and appropriate. It is not requisite to the issuance of a commission or a letter rogatory that the taking of the deposition in any other manner is impracticable or inconvenient; and both a commission and a letter rogatory may be issued in proper cases. A notice or commission may designate the person before whom the deposition is to be taken either by name or descriptive title. A letter rogatory may be addressed "To the Appropriate Authority in [here name of country]." Evidence obtained in response to a letter rogatory need not be excluded merely for the reason that it is not a verbatim transcript or that the testimony was not taken under oath or for any similar departure from the requirements for depositions taken within the United States under these rules.
(c) Disqualification for interest. No deposition shall be taken before a person who is a relative or employee or attorney or counsel of any of the parties, or is a relative or employee of such attorney or counsel, or is financially interested in the action.