Q: How do officers determine whether a driver should be investigated for DUI?

A:

Officers typically determine whether a driver should be investigated for DUI based on behavioral observations and certain indicators that suggest impairment. Common signs include erratic driving such as swerving or speeding, traffic violations, or being involved in an accident. Officers are trained to look for specific behaviors like slurred speech, bloodshot eyes, difficulty with coordination, and the smell of alcohol on the driver’s breath.

When an officer initiates a traffic stop, they may conduct field sobriety tests if they suspect impairment based on their observations. These tests help evaluate the driver’s physical and mental coordination. In California, there are standardized tests officers utilize, and the results can be used to determine whether a driver is likely under the influence of alcohol or drugs.

If the officer has reasonable suspicion that the driver is impaired, they may proceed with further assessments, including a preliminary alcohol screening test, which can be done roadside. In California, if a driver’s blood alcohol concentration (BAC) is measured to be 0.08% or higher, they can be charged with DUI; for commercial drivers, the legal limit is 0.04%, and for drivers under 21, zero tolerance applies, allowing for no measurable alcohol. Law enforcement follows these protocols to ensure that any investigation for DUI is in accordance with California law and protections for drivers’ rights are upheld.

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