Code of Civil Procedure Article 433
The court may, in a way which it considers convenient and appropriate, notify the witness or expert witness without serving them with a summons except in cases where such witness or expert witness has failed to appear at the session.
中文原文 民事訴訟法第433條
通知證人或鑑定人，得不送達通知書，依法院認為便宜之方法行之。
但證人或鑑定人如不於期日到場，仍應送達通知書。
但證人或鑑定人如不於期日到場，仍應送達通知書。