What is the Alco-Sensor Test used for in a DWI context?

The Alco-Sensor Test is utilized in a DWI context primarily to assess the level of alcohol in a suspect's system. This handheld device provides law enforcement officers with a preliminary breath test, allowing them to gauge whether a driver has consumed alcohol and, if so, to determine the concentration of alcohol present in their breath. The results from this test can assist officers in making informed decisions about whether further testing or arrest is warranted.

While other options mention aspects that may relate to sobriety checks or the influence of substances, the specific function of the Alco-Sensor is centered around alcohol detection, making it a critical tool in the DWI enforcement process.