During her term as the Yunlin County Commissioner, Su was arrested on 3 November 2008 on the charge of accepting bribes to the worth NT$5 million, equivalent to US$174,845.00, in a landfill approval case and was under prosecution for a 15-year jail sentence. Known for her great integrity, the news of her arrest triggered off a widespread public outrage. The court, however, ruled out her case and returned the verdict as not guilty.