This text investigates the technical protocols, analytical methodologies, and interpretative challenges inherent in the detection of illicit substances within human urine samples. Authors C. Nora Chiang and Richard L. Hawks provide a comprehensive framework for laboratory professionals and clinicians, drawing upon established toxicological standards and clinical research to delineate the complexities of drug screening and confirmation processes. The work serves as a technical manual for maintaining accuracy and legal defensibility in drug testing environments.

Experts in the field of clinical toxicology recognize this work as a foundational reference for laboratory standard operating procedures. Readers frequently note the technical density of the prose, which is tailored specifically for professionals requiring precise analytical guidance.