The information provided below is for theoretical and academic understanding only and does not constitute any form of encouragement or support for illegal behavior, nor does it constitute legal, medical or safety advice. The detection and identification of illegal drugs may involve legal issues in many regions, and such operations may bring serious risks. Before any actual use, you must fully understand the relevant local laws and regulations and consult professionals. Regarding the issue of rapid test strips, there are indeed some reagents and test tools for preliminary drug identification on the market, but the following points should be noted: 1. Generally speaking, many "drug test strips" or "reaction reagents" are mainly used to preliminarily determine the type of drug chemical composition (such as identifying MDMA, methamphetamine, heroin, etc.). Commonly used reagents include Marquis reagent, Mandelin reagent, Mecke reagent, etc. These reagents show color changes through specific chemical reactions between drugs and reagents, thereby helping users to preliminarily determine which category the detected substance may belong to. However, these reagents usually only provide qualitative information (i.e., whether a certain ingredient is contained) rather than a true "purity" percentage determination. 2. Another relatively popular test tool is the fentanyl test strips, which are mainly used to detect whether the drug contains the deadly fentanyl component, rather than comprehensively assessing other drug components or overall purity. Its working principle is usually to use specific antibodies or chemical reactions to produce recognition reactions for fentanyl and its analogs, thereby giving a positive or negative result. 3. In fact, the judgment of "purity" often requires more sophisticated analytical instruments, such as gas chromatography-mass spectrometry (GC-MS) or high-performance liquid chromatography (HPLC) and other laboratory equipment to make a more accurate and quantitative analysis. The detection process of such equipment is relatively complicated and does not fall into the category of rapid test strips. 4. In addition, some rapid detection reagents may have problems such as misjudgment and interference by other adulterants. The accuracy and reliability of the test results are limited and should not be used as the only basis for judgment, especially in cases involving health risks or legal issues. In short, although there are indeed some reagents and test strips on the market for preliminary detection of drug components, there is currently no test strip that can easily, quickly and accurately determine the purity of illegal drugs. Laboratory analysis methods can provide more reliable purity data. Please be reminded that any operation involving illegal drugs is potentially dangerous. Please be careful and understand all risks, and comply with local laws and regulations.