Police Duty Act Article 18

The operational units shall schedule the roster in accordance with the aforementioned rules, considering the security situations and available force, daily, and submit the rosters to the supervisory authority for reference. Any changes in the roster should be reported as well.
中文原文 警察勤務條例第18條
勤務執行機構應依勤務基準表,就治安狀況及所掌握之警力,按日排定勤務分配表執行之,並陳報上級備查;變更時亦同。

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