Weng was one of six newcomers nominated to serve on the National Communications Commission in July 2008,[2] after the term of the previous commission had ended in January of that same year.[3] At the time of her nomination to the NCC, Weng was a political independent.[4] All nominees, including Weng, were approved by the Legislative Yuan's joint committee on education, culture, and transportation,[5] and met with journalists for the first time the following month.[6] In February 2009, Weng attended a hearing convened to discuss amendments to the Satellite Radio and Television Act.[7] The following year, Weng commented on government investment in Taiwanese media,[8] discussed amendments to the Broadcasting and Television Act,[9] clarified aspects of NCC decisions,[10] and opposed a proposal allowing the Executive Yuan to select the NCC chair and vice chair.[11]
Weng was not renominated to her NCC post.[12][13] In 2012, her final year in office, Weng, Chen Jeng-chang, and Chung Chi-hui withdrew from a case involving Want Want and China Network Systems [zh].[14] Three years previously, as Want Want acquired the China Times, China Television, and Chung T'ien Television, images of Weng, Cheng, and Chung had been published on the China Times front page in the manner of wanted posters.[15] The merger between Want Want and China Network Systems was approved in late July 2008, with days left in Weng's NCC term.[16][17] During her final month on the National Communications Commission, television shopping network U-Life filed a lawsuit against Weng, alleging that she had favored the Eastern Home and Leisure Company in an application filed by the Kbro Company.[18]
Legislative Yuan
After her NCC tenure ended, Weng returned to her associate professorship in law at National Tsing Hua University.[19] She did not return to politics until the 2024 legislative election, when she was ranked fourth on the Kuomintang party list for proportional representation and elected to the 11th Legislative Yuan.[20][21]
Weng proposed amendments to the Act Governing the Legislative Yuan’s Power and the Criminal Code [zh], criminalizing the contempt of the legislature.[22] In 2024, she accused President Lai Ching-te of treason and criticized defense minister Wellington Koo for failing to maintain maps that showed Mongolia as part of the Republic of China.[23] After Taiwanese badminton players Lee Yang and Wang Chi-lin won the men's doubles gold medal at the 2024 Summer Olympics against Liang Weikeng and Wang Chang of China, Weng posted to WeChat, that the Lee–Wang victory was the "pride of Chinese people." When asked about her post, Weng elaborated, "We are Chinese... No matter who wins, Team Taiwan or the team from mainland China, it is still the pride of all Chinese people. I see nothing wrong in my statement."[24]