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Cocaine is one of the most frequently used illicit drug in the world. The chemical composition of cocaine samples varies according to the geographical region of the seizure, the production process (impurities), and the addition of adulterants and/or diluents. The concentration of cocaine in seized street samples may vary from 16 to 91% (w/w), in either hydrochloride salt and/or in the freebase form. The addition of diluents has been extensively reported and some of the common substances include carbohydrates (mannitol, lactose or glucose), boric acid, starch and sodium bicarbonate. Phenacetin, levamisole, lidocaine and caffeine are the most frequently found adulterants in seizures. Therefore, the development of simple and fast methods for the detection of cocaine and common adulterants, diluents and impurities are extremely important in forensic investigations. This service provides a method based on capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) for the rapid (2.5 min) and simultaneous quantification of cocaine, levamisole, lidocaine, carbonate, borate, chloride, nitrate, nitrite and sulphate.