Cocaine Purity - Drug Test KitEz Test Cocaine Purity Drug Test Kit Single use purity test kit. The most advanced test on the market for people who want to know what they are purchasing. The stronger the resulting reaction, indicates a sample contains a higher percentage of Cocaine. The Test Cocaine Purity is insensitive to the usual cuts such as mannitol and it does not react with levamisole. It does not react to any other substances from the family of cocaine (lidocaine,