A Michigan Subpoena to Appear and Testify at a Hearing or Trial in a Civil Action is a court document issued by a court of law which requires a person to appear in court to testify in a civil case. This type of subpoena is typically issued to witnesses who have some knowledge of the facts or events that are relevant to the case. It may also be issued to produce documents, tangible objects, or other physical evidence. There are two main types of Michigan Subpoena to Appear and Testify at a Hearing or Trial in a Civil Action: a subpoena ad testificandum and a subpoena duces tecum. A subpoena ad testificandum requires the recipient to appear in court and testify about matters relevant to the case. A subpoena duces tecum requires the recipient to appear in court and bring physical evidence (documents, tangible objects, etc.) that is relevant to the case.