Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Learn about the definition, signs, and clinical implications of drug addiction. Explore evidence-based resources and professional insights on substance use disorders.
Biological drug testing is a tool that provides information about an individual's recent substance use.