Different testing methods vary by their "detection window," or how far back they can identify drug use.
: Highly accurate but invasive; usually reserved for accidents or high-stakes clinical settings. Standard Drug Panels
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
Tests are often categorized by the number of substances they screen for, known as "panels".
: Typically screens for Amphetamines, Cocaine, Marijuana (THC), Opiates, and Phencyclidine (PCP).
: Often used for recent-use screening; results are usually available within 24 hours.