Oral fluid drug screeners can be used by police to detect the presence of some drugs in oral fluid, including THC. These devices are fast, non-invasive, and accurate. The police can demand an oral fluid sample, if they reasonably suspect a drug is in a driver’s body. Reasonable suspicion that the driver has drugs in their body can be developed based on objective facts, such as:
- red eyes
- muscle tremors
- abnormal speech patterns
If a driver tests positive on an oral fluid drug screener the positive result confirms the presence of the drug and, combined with other signs of impairment or drug use observed by the police at the roadside, may provide grounds for the investigation to proceed further by making a demand for a blood sample.