In addition to measuring illegal heroin samples, the system allows the determination, usually within 5 minutes, of impurities and adulterants in the samples. MECC incorporates a micelle in the run buffer allowing for the separation of both charged and neutral compounds in a single run. Linearity, accuracy, and reproducibility studies of heroin using this method were established, and comparisons to a commonly used gas chromatographic method show good correlation. MECC is an enhanced technique which eliminates some of the disadvantages encountered with gas chromatography and high-performance liquid chromatography. Coupling this system with a diode array or rapid scanning ultraviolet detector would further enhance specificity of detection. 1 figure, 5 tables, and 19 references