When it comes to drug testing, one question is asked more than any other: "How far back does a saliva test go?"
Unlike urine tests, which look for metabolites that can stay in the body for weeks, oral fluid (saliva) testing is designed to detect recent use. This makes it the preferred method for Australian workplaces and safety-conscious parents, as it identifies actual impairment rather than lifestyle history.
General Detection Windows for Saliva
While individual metabolism and test kits varies, here are the standard detection windows for the DrugCheckExpress SalivaTracer™:
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THC (Cannabis): 12–24 hours (Casual use) up to 72 hours (Heavy/Chronic use).
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Methamphetamine (Ice): 24–48 hours.
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Amphetamines (Speed): 24–48 hours.
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Cocaine: 24–48 hours.
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Opiates (Heroin, Codeine): 6–48 hours.
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Benzodiazepines: Up to 48 hours.
Why "Recent Use" Matters
If you are managing a workplace, you aren't necessarily looking to punish someone for what they did on their weekend off. You are looking to stop an accident from happening today.
Because saliva testing targets these shorter windows, a positive result typically indicates the substance is still active in the donor's system. This correlates much more closely with fitness for work than urine testing ever can.
Factors That Influence Detection
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Hydration: Severe dehydration can concentrate saliva.
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Method of Use: Smoking or oral ingestion often leaves residue in the mouth longer.
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Metabolism: Everyone processes substances at different speeds.
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