Mutual Legal Assistance in Criminal Matters Act Article 18

1. Persons from the Requesting Party may be allowed to appear at the scene of the implementation of the request, upon the consent of the Assisting Body.2. In the circumstance of the preceding paragraph, Paragraph 3 of the last preceding Article shall apply if the Requesting Party finds it necessary to request the Assisting Body to pose additional questions.
中文原文 國際刑事司法互助法第18條
請求方人員經協助機關同意後,得於執行請求時在場。
前項情形,請求方人員於協助機關詢問或訊問時,發現有請求書未記載之相關必要事項時,適用前條第三項之規定。

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