A New York Subpoena to Testify at a Hearing or Trial in a Criminal Case is a legal document issued by a court requiring an individual to appear before a court and provide testimony in a criminal case. This type of subpoena is issued to witnesses who are not parties in the case and requires them to appear at a criminal hearing or trial. The subpoena can also be used to require the production of documents or objects relevant to the case. There are two types of New York Subpoena to Testify at a Hearing or Trial in a Criminal Case: a subpoena ad testificandum and a subpoena duces tecum. A subpoena ad testificandum requires an individual to appear at a hearing or trial to provide testimony. A subpoena duces tecum requires an individual to appear and produce documents or objects relevant to the case. Both types of subpoenas are issued by a court and must be signed by a judge or a clerk.