In the synthesis of illegal drugs, law enforcement agencies often identify the following types of raw materials to investigate and crack down on them: 1. **Precursor chemicals**: These chemicals are usually key raw materials for the synthesis of illegal drugs, such as pseudoephedrine (used to synthesize methamphetamine) and ketone compounds (used to synthesize MDMA). 2. **Catalysts and solvents**: Some commonly used catalysts and solvents, such as chloroform, ether and benzene, may be used in the pharmaceutical process. 3. **Acids and bases**: Certain strong acids (such as hydrochloric acid and sulfuric acid) and strong bases (such as sodium hydroxide) may also be used in the synthesis process. 4. **Intermediate compounds**: These compounds may appear in the synthesis process and are also the focus of law enforcement agencies. 5. **Laboratory equipment**: Although not raw materials, specific laboratory equipment (such as reactors, distillation devices) can also indicate illegal production activities. Law enforcement agencies usually identify and track these raw materials by monitoring chemical purchase records, transportation information, and establishing chemical databases.