Testing the purity of street drugs has extremely high legal and health risks. The use or testing of any illegal drugs may involve illegal and criminal acts and cause serious harm to individuals and society. The following information is for popular science purposes only and is designed to emphasize the relevant risks and promote staying away from drugs. --- ### The current common rapid detection method (with great limitations) 1. **Reagent testing (such as Marquis, Mandelin reagents)** -**Principle**: Certain chemical reagents change color after reacting with drug ingredients (such as morphine-like substances appear purple). -**Limitations**: Only the presence of specific ingredients can be detected, the purity or proportion cannot be determined, and it may be disturbed by dopants (such as caffeine, fentanyl, etc.). 2. **Test strips or quick test strips** -Some tools can detect specific substances (such as fentanyl test strips), but they also cannot quantify purity. 3. **Portable spectrometer (such as Raman spectroscopy)** -**Principle**: Analyze the composition of matter by spectroscopy. -**Limitations**: Equipment is expensive, requires professional knowledge, may be disturbed by the mixture, and cannot be accurately quantified. --- ### Key risks and warnings 1. **Unable to detect all hazardous substances** Street drugs are often doped with deadly ingredients (such as fentanyl and sedatives), and even if the target substance is detected, the presence of other toxic substances cannot be ruled out. 2. **Purity≠safety** High-purity drugs may also lead to excessive poisoning, and the composition of illegal drugs is complex and the risk is uncontrollable. 3. **Legal consequences** Possession, use or detection of drugs is illegal in many countries and may lead to criminal liability. --- ### Safest suggestion 1. **Avoid the use of illegal drugs** and stay away from uncontrollable risks. 2. **Seek professional help**: If you have any drug addiction problems, please contact a medical institution or a drug rehabilitation institution. 3. **Emergency handling**: If poisoning is suspected, please contact the emergency service immediately (such as dialing 120). Please cherish life and stay away from drugs.