Police Power Exercise Act Article 11
The police may observe people in the following activities through visual inspection or technology tools, to collect data over the reasonably expected behaviors or life activities irrelevant to personal privacy or secrecy within a specified period of time that is deemed necessary and with the prior written approval of a police department chief in order to prevent crimes:1. People who are believed on the basis of sufficient facts to be likely to commit a crime that is punishable by at least five years’ imprisonment.2. People who are believed on the basis of sufficient facts to be likely involved in professional, habitual, syndicated, or organized crimes.Each period of time stipulated in the preceding paragraph may not exceed one year but may be extended once at most when deemed necessary. When such data collection is no longer necessary, it must immediately cease.Data collected as stipulated in paragraph 1 shall be destroyed immediately after the purpose is fulfilled unless the data must be kept for the investigation of criminal acts.
中文原文 警察職權行使法第11條
警察對於下列情形之一者，為防止犯罪，認有必要，得經由警察局長書面同意後，於一定期間內，對其無隱私或秘密合理期待之行為或生活情形，以目視或科技工具，進行觀察及動態掌握等資料蒐集活動：
一、有事實足認其有觸犯最輕本刑五年以上有期徒刑之罪之虞者。
二、有事實足認其有參與職業性、習慣性、集團性或組織性犯罪之虞者。
前項之期間每次不得逾一年，如有必要得延長之，並以一次為限。
已無蒐集必要者，應即停止之。
依第一項蒐集之資料，於達成目的後，除為調查犯罪行為，而有保存之必要者外，應即銷毀之。
一、有事實足認其有觸犯最輕本刑五年以上有期徒刑之罪之虞者。
二、有事實足認其有參與職業性、習慣性、集團性或組織性犯罪之虞者。
前項之期間每次不得逾一年，如有必要得延長之，並以一次為限。
已無蒐集必要者，應即停止之。
依第一項蒐集之資料，於達成目的後，除為調查犯罪行為，而有保存之必要者外，應即銷毀之。