A Michigan Subpoena to Testify at a Deposition in a Civil Action is a legal document issued by a court or by a party in a civil action (a lawsuit) to compel a person to appear at a deposition. The person receiving the subpoena must attend the deposition and answer questions under oath. There are two main types of Subpoena to Testify at a Deposition in a Civil Action issued in Michigan: the Subpoena Ducks Cecum and the Subpoena Ad Testificandum. The Subpoena Ducks Cecum is a document that requires a person to appear at the deposition and bring certain documents or records that are relevant to the case. The documents might include records, emails, photos, or other materials that are necessary for the case. The Subpoena Ad Testificandum is a document that requires a person to appear at the deposition and answer questions about the case. The person must answer truthfully and under oath, and the answers may be used as evidence in the case. Both types of Subpoena to Testify at a Deposition in a Civil Action must be served on the person receiving the subpoena. This means it must be delivered to the person in person or by mail. The person served with the subpoena must provide proof of service to the court.