Hair analysis is nothing but the chemical analysis of a hair sample. Hair in the human body can be considered for retrospective purposes when blood and urine in the body are no longer expected to contain a particular contaminant, may be typically in a year or less. Hair analysis is most widely used in the fields of forensic toxicology department and also increasingly in environmental toxicology. Several alternative medicine fields also uses various hair analyses for the environmental toxicology departments but later these uses are found be controversial, evolving and not standardized as well in the medical phenomenon. Hair analysis is mainly used by the forensic department. Hair analysis can be referred to the forensic technique of accessing a number of different characteristics of hairs in order to determine the various characters that they have a common source and when taken into example comparing hairs, found at the scene of the crime with various hair samples taken from the suspect and it is taken into consideration. Hair analysis treatment is also used for the detection of many therapeutic drugs which includes various other illegal products which is against the law of consideration in short against law.