現行行政機關實施行政調查之方法及程序，並無一部完整之行政調查專法規範，主要仍係依行政程序法第39條至第42條規定列舉之得通知相關之人到場陳述意見、得要求提供文書、資料或物品、送請鑑定及實施勘驗等調查手段進行，鑑於現今科技日新月異及為實現調查目的之必要，若僅依前開規定之調查方法，似無法有效使警察機關達成發現事實真相之目的。因此，行政調查之證據及方法對警察機關從事行政調查占有極重要之地位，有深入探討之必要，爰本文希透過行政調查之理論基礎，探討警察行政調查裁處法制與運用之關連，並分析檢討現行規範闕漏之處，提出整體規範之建議，作為日後行政調查程序之法源修正依據，或能制定一部完整之行政調查專法，俾供警察機關於實施行政調查時，據以遵循。

The current methods and procedures for administrative investigations carried out by administrative agencies do not have a complete set of special administrative investigation regulations. They are still listed in accordance with the provisions of Articles 39 to 42 of the Administrative Procedure Law. It may request to provide documents, materials or articles, send for identification and conduct investigations and other investigative methods. In view of the rapid development of today's technology and the need to achieve the purpose of investigation, if only the investigation methods prescribed in the previous regulations are followed, it seems that the police cannot effectively make the purpose of the discovery truth. Therefore, the evidence and methods of administrative investigation occupies an extremely important position for police agencies to conduct administrative investigations. Therefore, it is necessary to explore in depth. This article hopes to use the theoretical basis of administrative investigation to explore the relationship between the legal system and the application of police administrative investigation and adjudication, and analyze it. Review the current norms’deficiencies and give suggestions on the overall norms, and serve as the basis for the revision of the legal source of the administrative investigation procedures in the future, or formulate a complete administrative investigation law for the police to conduct administrative investigations and to follow.