There are many industries where practitioners may be exposed to chemicals required for the manufacture of illegal drugs. Here is an introduction for you.： 1. **Chemical industry**: Practitioners in the chemical industry are exposed to a wide variety of chemicals, some of which can be used in the manufacture of illegal drugs. For example, some precursor chemicals used in the manufacture of synthetic drugs, such as ephedrine and pseudoephedrine, may be used as raw materials for medicine or other legal purposes in chemical production, but they are also easily obtained by criminals for the illegal manufacture of meth and other drugs. 2. **Pharmaceutical industry**: The pharmaceutical industry involves the production and use of a large number of chemicals and apis. Certain chemicals used in the production of drugs may be used in the manufacture of illegal drugs. For example, some intermediates of psychotropic drugs may flow into illegal channels if they are not managed well. 3. **Printing and dyeing, coating and ink industries**: Some organic solvents and chemical raw materials used in these industries, such as toluene and acetone, are also chemicals commonly used in the manufacturing process of illegal drugs. Criminals may use channels in these industries to obtain these chemicals for the manufacture of drugs. 4. **Education and scientific research institutions**: In the chemical laboratories of schools, universities and scientific research institutions, various hazardous chemicals are often stocked, many of which can be used in the manufacture of illegal drugs. If safety management measures are not in place, these chemicals may be stolen or misused. 5. **Agriculture and horticulture industry**: Some chemicals contained in pesticides, insecticides and other products, such as certain organophosphorus compounds, may be illegally used in the manufacture of drugs. In addition, some chemicals used in plant growth regulation may also be abused. 6. **Food and beverage industry**: Certain additives and raw materials used in the food industry, such as alcohol and acetic anhydride, can be used in the manufacture of illegal drugs. For example, acetic anhydride is one of the important raw materials for the manufacture of heroin. 7. **Electronics industry**: Some chemicals used in the electronics industry, such as chloroform and carbon tetrachloride, also have certain uses in the manufacture of illegal drugs. These chemicals are used in processes such as cleaning and etching of electronic components and may be illegally obtained.