Attorney Regulation Act Article 19

Those who have received their attorney license and been admitted to a local bar association and the National Bar Association may practice law in the territory of the Republic of China in accordance with this Act.
中文原文 律師法第19條
領有律師證書並加入地方律師公會及全國律師聯合會者,得依本法規定於全國執行律師職務。

English translation for reference only; the Chinese text prevails. Not legal advice.