The following content is only for public information sorting and academic discussion, and does not constitute guidance or encouragement for any illegal activities. Many chemicals have legitimate uses in legal production and research, but due to their chemical properties, they may also be abused for illegal synthetic drugs. In fact, it is precisely based on the characteristic of "dual use" (can be used legally and may also be used for illegal purposes) that regulatory authorities strictly regulate the production, sale and circulation of these chemicals. The following lists some industries and practitioners who may be exposed to such chemicals, but it does not imply that these practitioners are engaged in illegal activities: 1. Chemical and fine chemical industry • During the production, preparation and processing of chemical raw materials and intermediates, they will be exposed to a variety of organic solvents, substrates or catalysts, and some of these compounds may be used in illegal pharmaceutical production. • In particular, in some companies that specialize in the production of chemical reagents, catalysts or reaction intermediates, employees may be exposed to chemicals of high purity or specific reaction activity. 2. Pharmaceutical industry • In the process of legal drug production and research and development, the raw materials, reagents or intermediates commonly used in pharmaceutical company laboratories and production workshops sometimes overlap with the chemicals required for illegal drug manufacturing. • Especially in cases involving new drug development or requiring a dedicated synthesis route, researchers will use a variety of compounds, some of which may include substances that are at risk of being used for illegal purposes. 3. Pesticide and agricultural chemical production field • Some compounds used in pesticides, herbicides, fungicides and other products may have similar chemical properties to certain drug precursors, and their legal and illegal uses overlap. • Technicians and inspectors in related laboratories or production units may also be exposed to these chemicals. 4. Analytical testing and environmental monitoring laboratories • In professional fields such as environmental monitoring, chemical analysis, and forensic testing, laboratory technicians need to use a variety of analytical reagents, which are sometimes similar to common reaction reagents in industry. • These reagents are widely used in normal testing, but if they flow into informal channels, they may be abused. 5. Specialty chemical sales and wholesale field • Chemical traders, distributors, and supply chain management personnel will be exposed to a variety of industrial and laboratory reagents. • Because of the large supply volume and wide variety, some substances in these channels may also become targets for illegal use, so countries usually have strict import and export and sales record management for such chemicals. It is important to note that: • Most of the chemicals in the above industries are common industrial raw materials or professional reagents that are legally produced and used, and the vast majority of practitioners are performing their legal duties; • Governments and regulatory agencies usually implement multiple regulatory measures such as purchaser registration, sales licenses, and transaction records for chemicals that may be used in the illegal manufacture of drugs (commonly referred to as "precursor chemicals" or "controlled chemicals"); • The purpose of information disclosure is to help the public understand relevant regulatory policies and industry characteristics, rather than to guide or encourage any illegal behavior. In short, although chemicals are widely used in multiple legal fields, their dual-use characteristics also require practitioners and regulatory authorities in various industries to remain highly vigilant. Any behavior involving the purchase, sale and use of chemicals should strictly comply with the laws and regulations of the country and region where they are located.