Control Act Article 30

The Control Yuan may entrust another agency to investigate a designated case or matter. After accepting the case, the agency shall proceed with the investigation immediately and reply to the Control Yuan in writing.
中文原文 監察法第30條
監察院於必要時,得就指定案件或事項,委託其他機關調查。
各機關接受前項委託後,應即進行調查,並以書面答復。

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