It’s possible to test positive for illegal drugs without taking one.
January 1
This is true...at least when it comes to initial urine SCREENING tests.
Certain substances can cause false positives on urine immunoassay-based screens...but the same sample will come back negative with a stricter laboratory-based test such as gas chromatography-mass spectrometry (GC-MS) or high-performance liquid chromatography (HPLC).
SCREENING tests for opiates and amphetamines often result in false positives.
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