According to Article 29 of “Petroleum Administration Act”: (1) Only petroleum products that meet the national standards can be imported or sold in the domestic market. (2) The central competent authority may send personnel or entrust a professional institution to examine the quality of the petroleum products sold, and the business may not obstruct, refuse, or evade such examination. There are currently more than 2,500 gasoline stations in Taiwan. In order to ensure the qualities of gasoline and diesel oils in the stations for the protection of people’s rights and interests, the authority entrusts the professional testing institution to conduct inspections of petroleum products every year.