Cocaine, derived from the leaves of coca plant, is a potent central nervous system(CNS) stimulant and a local anesthetic. Cocaine induces euphoria, confidence and a sense of increased energy in the user; these psychological effects are accompanied  by increase heat rate, dilation of the pupils,fever,tremors and sweating. Cocaine is used by smoking, intravenous, intranasal or oral administration and excreted in the urine as benzoylecgonine in a short time. Benzoylecgoline has a biological half life of 5-8 hours. It can be generally de detected  f0r 24-60 hours after cocaine use or exposure.