A Louisiana Subpoena To Appear And Testify At Hearing Or Trial In Civil Action is a court order that requires an individual to appear in court in order to testify as a witness in a civil action. This type of subpoena may be issued by either the plaintiff or defendant in a case. There are two types of Louisiana Subpoena to Appear and Testify at Hearing or Trial in Civil Action: a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum requires an individual to bring certain documents to court that are related to the case. A Subpoena Ad Testificandum requires an individual to testify as a witness in court. Both types of subpoenas must be served to the person before they are required to appear in court. Failure to obey a subpoena can result in penalties, including fines and even imprisonment.