Police Power Exercise Act Article 8

The police may stop any form of transportation that poses a hazard or is likely to pose a hazard according to objective and reasonable judgment and utilize the following measures:1. Require the driver or passengers to show their IDs, or verify their identities.2. Check the Vehicle Identification Number, engine number or other identifiable features of the vehicle.3. Require the driver to take a breathalyzer test.When the police reasonably suspect that the driver or passenger of the means of transportation provided in the preceding paragraph will pose a hazard based on their unusual behavior, the police may order the person to exit the vehicle. When there are sufficient facts indicating the possibility that the person may commit a crime, the police may also search the vehicle.
中文原文 警察職權行使法第8條
警察對於已發生危害或依客觀合理判斷易生危害之交通工具,得予以攔停並採行下列措施:
一、要求駕駛人或乘客出示相關證件或查證其身分。
二、檢查引擎、車身號碼或其他足資識別之特徵。
三、要求駕駛人接受酒精濃度測試之檢定。
警察因前項交通工具之駕駛人或乘客有異常舉動而合理懷疑其將有危害行為時,得強制其離車;有事實足認其有犯罪之虞者,並得檢查交通工具。

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