During his time as Taipei's mayor, Ma had many conflicts with the central government over matters such as health insurance rates and control of the water supply during the drought. Ma also was implicated in a scandal of Taipei Bank stock releases in 2003. However, the case was dismissed after an investigation by the Taipei prosecutor. He was strongly criticized by the DPP for not allowing the ROC national flag to be flown along with a PRC flag during Asian Women's Football Championship held in Taipei. Ma responded that he was merely following Olympic protocol, which only officially recognizes the Chinese Taipei Olympic Flag and forbids ROC national flags from being shown in an Olympic Game Stadium.