Within a year after Charng Ching launched these kits in the virgin fields of Taiwan, the market was flooded with low-priced competitors. This angered the company, and they started suing everybody, including the major distributors of the lower priced kits in Taiwan and the ministries of education and defense, which are major purchasers. It stirred up quite a controversy here in Taiwan, and the case is still in the courts.
長青氣憤之餘，到處興訟，不僅控告購買台灣廠商試劑的教育部、國防部，還控告販賣這類試劑的通路商如萬寧、屈臣氏及康是美等等，在國內掀起連番風波，目前仍在士林地方法院審理中。