Social Order Maintenance Act Article 61

The appeal against a ruling made by a police authority or a summary court may be withdrawn before the result of it been determined.The withdrawal of an appeal to the ruling of a police authority or a summary court should be filed in writing to the original authority which has received the appeal.
中文原文 社會秩序維護法第61條
聲明異議或抗告,於裁定前得撤回之。
撤回聲明異議或抗告,應以書狀向受理機關為之。
但於該案卷宗送交受理機關以前,得向原裁處機關為之。

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