Florida Drug and Alcohol Traffic Awareness TSLAE Practice Exam 2025 – All-In-One Guide to Master Your Certification!

A Breathalyzer is specifically designed to measure a person's blood alcohol concentration (BAC) by analyzing their breath. When someone blows into the device, it captures the alcohol content present in their breath, which correlates directly to the concentration of alcohol in their bloodstream. This allows law enforcement officers to determine whether a driver is over the legal limit for alcohol consumption.

The other options describe functions that are not applicable to a Breathalyzer. For example, while assessing a driver’s mood may involve various psychological evaluations, it does not pertain to breath analysis or BAC measurement. Similarly, measuring driving speed involves speedometers or radar devices, and detecting drugs in the bloodstream typically requires blood tests or urine tests, not breath analysis. Therefore, the answer that accurately describes the primary function of a Breathalyzer is the measurement of blood alcohol concentration through breath.