What is an example of a physical cue reinforcing suspicion of DWI?

An abrupt swerve is a clear indicator that a driver may be impaired. This behavior often signifies a lack of control over the vehicle, which can stem from the driver's inability to maintain the necessary attention and motor skills needed for safe driving. When an individual is under the influence of alcohol or drugs, their coordination and reaction times can be significantly affected, leading to sudden and erratic movements such as swerving. Observing such a cue can reinforce an officer's suspicion of driving while intoxicated (DWI), prompting further investigation through field sobriety tests or other measures.

In contrast, behaviors like consistent speed, careful driving, and maintaining the proper lane are often associated with responsible driving. These behaviors would not typically raise suspicion about a driver's fitness to operate a vehicle.