Texas Application for Subpoena — Criminal is a legal document used to request evidence or testimony in a criminal matter. The request must be approved by a judge before it can proceed. There are two types of Texas Application for Subpoena — Criminal: a civil subpoena and a criminal subpoena. A civil subpoena is used for civil cases, such as requesting documents or witness testimony in a civil lawsuit. A criminal subpoena is used to obtain evidence, such as physical evidence or testimony, in a criminal case. Both types of subpoenas must be signed by a judge in order to be valid.