This Guide surveys the field of contraband drug detection methods. It includes background information on the problem of contraband drugs in the United States, the various applications of drug detection, and a discussion of considerations that are important in choosing a drug detection system. It examines four major types of drug detection: trace detection technologies (mechanical "sniffers"), canine detection, bulk detection technologies (e.g., x-ray and other imaging techniques), and manual search techniques. Also included: a list of Web sites for companies making trace and bulk detection systems, basic information on common drugs of abuse, and a glossary of terms.