What does a subpoena ad testificandum require from the individual receiving it?

A subpoena ad testificandum is a legal document that compels an individual to testify under oath in a legal proceeding, such as in a court of law. This type of subpoena is specifically focused on ensuring that a person's testimony is heard as part of the judicial process. It differs from other types of subpoenas, such as a subpoena duces tecum, which requires the delivery of documents or evidence.

The essence of a subpoena ad testificandum lies in the obligation it places on the individual to provide their verbal account or knowledge regarding matters relevant to the case. In essence, it serves to uphold the integrity of the trial by ensuring that all pertinent witness testimonies are obtained to inform the judicial decision.

Other options, while they may relate to legal processes, do not pertain to the requirement of appearing to testify. For instance, delivering documentation pertains to a different type of subpoena, and obtaining certification or paying fines are not requirements associated with testifying. Thus, the core duty imposed by a subpoena ad testificandum is indeed to testify in court.