Learn about when drug tests may take place, the type of tests, and the process.
When might a drug test take place?
Breath (alcohol only)
Positive test indicates person is impaired by alcohol.
Urine
Can detect drug use that occurred in last 3 days.
Saliva
Can detect drug use in the last 1-3 days.
Hair
Can detect drug use up to 6 months – but cannot determine recent use or single use of a drug.
A sample is collected and screened using a ‘point of collection’ device. The accuracy of these devices can vary and ‘false positive’ readings are possible.
Drug tests require laboratory screening to confirm their accuracy. For alcohol, a second breathalyser test is given at least 20 minutes after the first positive result to confirm initial blood alcohol levels.
If you want to make a complaint or understand your rights regarding workplace testing, go to: