Drug — Test

A is a technical analysis of a biological specimen—most commonly urine, hair, blood, or oral fluid—to determine the presence or absence of specific illegal drugs or their metabolites. Common Drug Test Types

: The most common for employment and legal reasons; can detect substances for days or weeks depending on the drug. DRUG TEST

Different testing methods vary by their "detection window," or how far back they can identify drug use. A is a technical analysis of a biological

: Often used for recent-use screening; results are usually available within 24 hours. known as "panels".

Tests are often categorized by the number of substances they screen for, known as "panels".