Regulations Governing Visiting, Residency, and Permanent Residency of Aliens Article 21
The competent authority or any relevant authority shall, upon the discovery or knowledge of any foreign national whose reason for stay or residency no longer exists, notify the NIA.
中文原文 外國人停留居留及永久居留辦法第21條
外國人停留或居留原因消失，經目的事業主管機關或相關機關查獲或知悉者，應通報移民署。