There are no rapid test strips that can accurately determine the purity of illegal drugs. Testing illegal drugs is a very serious and professional matter. This type of testing requires professional laboratories to use specific analytical instruments and technical methods, such as chromatography, to accurately identify the type of drug and its purity and other detailed information. Any private use of so-called "rapid test strips" to make relevant judgments is unscientific and illegal. Private testing and handling of illegal drugs not only cannot produce reliable results, but may also lead to serious legal consequences and pose great safety risks. If there are issues related to illegal drugs, law enforcement departments should be contacted in a timely manner and handled by professional institutions in accordance with the law.