Hair as a Biological Indicator of Drug Use, Drug Abuse or Chronic Exposure to Environmental Toxicants

In recent years hair has become a fundamental biological specimen, alternative to the usual samples blood and urine, for drug testing in the fields of forensic toxicology, clinical toxicology and clinical chemistry. Moreover, hair-testing is now extensively used in workplace testing, as well as, on legal cases, historical research etc. This article reviews methodological and practical issues related to the application of hair as a biological indicator of drug use/abuse or of chronic exposure to environmental toxicants. Hair structure and the mechanisms of drug incorporation into it are commented. The usual preparation and extraction methods as well as the analytical techniques of hair samples are presented and commented on. The outcomes of hair analysis have been reviewed for the following categories: drugs of abuse (opiates, cocaine and related, amphetamines, cannabinoids), benzodiazepines, prescribed drugs, pesticides and organic pollutants, doping agents and other drugs or substances. Finally, the specific purpose of the hair testing is discussed along with the interpretation of hair analysis results regarding the limitations of the applied procedures.

Self-mutilation induced by cocaine abuse: the pleasure of bleeding

INTRODUCTION

Self-mutilation is direct and deliberate harm to one's body without conscious intent to die. It is observed in both men and women with various psychiatric disorders, but most of those who self-mutilate are women diagnosed with borderline personality disorder. Cocaine addiction is a significant worldwide public health problem, associated with somatic, psychological, psychiatric, socioeconomic and legal complications. Amphetamine use, but not cocaine use, has previously been associated with severe self-injurious behavior.

CASE

We report here a case of a female patient with recurring self-injurious behavior ("the pleasure of bleeding") induced by cocaine abuse.

DISCUSSION

The clinical characteristics of self-mutilation are manifold and there is a lack of agreement about its etiology. The complex behavior associated with cocaine abuse may be one cause of self-mutilation. Dysfunction of the inhibitory brain circuitry caused by drug addiction could explain why this cocaine-addicted patient loses control and self-mutilates during cocaine use.