Detecting the purity of street drugs is a complex and dangerous process, and there is no absolutely fast and safe way. The following are some common testing methods, but please note that these methods are not completely reliable and may involve legal risks. ### 1. **Reagent test** -**Kits**: There are some kits on the market that are specifically used to detect drugs, such as Marquis Reagent, Mandelin Reagent, etc. These reagents can preliminarily determine the composition and purity of drugs through color changes. -**Limitations**: Reagent testing can only provide preliminary qualitative analysis, cannot accurately determine purity, and the detection effect of the mixture is poor. ### 2. **Laboratory analysis** -**Professional laboratory**: Send samples to a professional laboratory for gas chromatography-mass spectrometry (GC-MS) or high performance liquid chromatography (HPLC) analysis to obtain accurate composition and purity information. -**Limitations**: This method requires professional equipment and knowledge, and may involve legal risks. ### 3. **Visual and olfactory examination** -**Appearance**: By observing the color, shape, crystallinity and other characteristics of drugs, its purity can be preliminarily judged. -**Smell**: Some drugs have a unique smell, which can be preliminarily judged by smell. -**Limitations**: This method is very inaccurate and may cause harm to health. ### 4. **Use portable equipment** -**Portable spectrograph**: Some portable devices, such as Raman spectrograph, can quickly detect the composition of drugs on site. -**Limitations**: These devices are expensive and require professional knowledge to operate and interpret the results. ### 5. **Legal and health risks** -**Legal risks**: The possession, use or detection of drugs is illegal in many countries and regions, and may face serious legal consequences. -**Health risks**: Direct exposure to drugs may cause serious harm to health, even fatal. ### 6. **Seek professional help** -**Medical and psychological counseling**: If you or someone you know is using drugs, it is recommended to seek professional medical and psychological counseling help. -**Drug rehabilitation institutions**: Many countries and regions have specialized drug rehabilitation institutions that can provide support and help. ### Conclusion There is no absolutely fast and safe way to detect the purity of street drugs. The safest and most effective way is to avoid exposure to drugs and seek professional help. If you have any drug-related questions or concerns, it is recommended to contact a professional or relevant organization immediately.