The Pennsylvania Oath of Unavailability of Witness is a sworn statement made by a witness in a criminal or civil case, attesting that they are unable to appear in court and testify. The oath must be taken before a notary public or other authorized official, and it must state that the witness can no longer appear in court, due to circumstances beyond their control. There are two types of Pennsylvania Oath of Unavailability of Witness: The first type is a temporary oath, made when the witness is unable to appear in court due to a temporary inability, such as medical issues or travel restrictions. This type of oath may be revoked at any time by the witness. The second type is a permanent oath, made when the witness knows they are unable to appear in court due to a permanent inability, such as age, death, or moving out of the area. This type of oath cannot be revoked.