Witness Protection Act Article 18

Any person who attempts to prevent or retaliate the protected witness to testify in front of the prosecutor or in court and commits a crime against the protected witness, shall be subjectto the punishment prescribed for such offense increased up to one half.
中文原文 證人保護法第18條
意圖妨害或報復依本法保護之證人到場作證,而對受保護人實施犯罪行為者,依其所犯之罪,加重其刑至二分之一。

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