A Pennsylvania Subpoena to Attend And Testify is a legal document issued by a court of law in the Commonwealth of Pennsylvania to require a witness to appear in court to give testimony. The subpoena can require the witness to bring documents or other physical evidence with them to the trial. This type of subpoena is used in civil and criminal cases, as a way to compel witnesses to be present to testify in court. There are two types of Pennsylvania Subpoena to Attend And Testify: a subpoena ad testificandum and a subpoena duces tecum. A subpoena ad testificandum requires the witness to appear in court and give testimony. A subpoena duces tecum requires the witness to appear in court and bring documents or other physical evidence with them.