How saliva (oral fluid) testing works
A collector swabs the inside of the mouth to capture an oral-fluid sample. Because the collection happens in the open and is directly observed, there's no opportunity to substitute or dilute the sample — one of the biggest advantages over urine. A rapid oral-fluid device can give a preliminary result on-site, and non-negatives can be sent to a certified lab for confirmation.
What saliva testing is best for — the detection window
Oral fluid shines at catching recent use. Many drugs appear in saliva within minutes of use and stay detectable for roughly 24 to 48 hours (some a bit longer). That shorter window is a feature, not a bug — it makes saliva the go-to for situations where recent impairment is the question:
- Reasonable-suspicion testing — when a supervisor observes signs on the job
- Post-accident testing — to establish recent use close to an incident
- Rapid pre-employment screening — fast, low-hassle, hard to cheat
- Random workplace testing — quick collection with minimal disruption
If you instead need a longer look-back, urine covers roughly the past few days and a hair follicle test can show a pattern up to about 90 days. We'll help you pick the window that answers your question.
DOT and oral-fluid testing
The U.S. Department of Transportation has updated its rules to recognize oral-fluid testing as an option alongside urine for DOT-regulated programs. Oral fluid can reduce the chance of cheating and is easier to collect on-site. If you manage DOT-covered drivers and want to understand your oral-fluid options, talk to us — we keep current with 49 CFR Part 40 and can walk you through it.
Same-day, honest pricing
Rapid saliva screens start around $30, with lab confirmation available when a result needs to be defensible. Walk-ins are welcome and we'll confirm the exact price before you come in.