Burns, M. (2006). Tucson, AZ: Lawyers & Judges Publishing Company.

Drug use is at least as long standing as recorded history. Many centuries ago humans, as well as some animal species, discovered medicinal and intoxicant properties of a variety of plants. As predicted in the first edition of Medical-Legal Aspects of Drugs, drug use continues to be a problem but there have been significant changes. Drugs of choice and use trends have changed and new issues have surfaced. Drug options have expanded with the discovery and re-discoveries of intoxicating plant materials ....

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