Researchers at Shinshu University's Department of Chemistry attempted to establish technology that enables simple, highly sensitive, and selective screening and analysis of stimulants, namely components of regulated toxicants. The number of arrests for the possession or use of methamphetamine and other illegal substances in Japan has exceeded 10,000 per year, which has become a serious social problem. Therefore, there is high demand in the fields of forensic science and clinical chemistry for simple test methods that can be applied to field analysis for a large number of samples.