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

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

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

: Highly accurate but invasive; usually reserved for accidents or high-stakes clinical settings. Standard Drug Panels

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

: Provides a long-term history of drug use, often looking back up to 90 days.

Different testing methods vary by their "detection window," or how far back they can identify drug use.

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