In a foreign country, depositions may be taken on notice:(1) Before a person authorized to administer oaths in the place in which the examination is held, or(2) before a person or officer commissioned by the court for this purpose, or(3) pursuant to a letter rogatory.A commission or a letter togatory shall be issued only when necessary and convenient, on application and on such terms and with such directions as are just and appropriate. Officers may be designated in notices or commissions either by name or descriptive title and letters rogatory may be addressed 'To the Appropriate Authority in (here the name of the 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 Puerto Rico.