A more thorough explanation:

Breathalyzer

A breathalyzer is a tool that police officers use to check how much alcohol is in a driver's body by testing their breath.

For example, if a police officer pulls over a driver who they suspect has been drinking, they may ask the driver to blow into a breathalyzer. The breathalyzer will then give a reading that shows how much alcohol is in the driver's system. If the reading is above the legal limit, the driver may be arrested for driving under the influence (DUI).

Another example is if someone is at a party and they want to make sure they are safe to drive home, they can use a personal breathalyzer to check their own alcohol level before getting behind the wheel.

The examples illustrate how a breathalyzer is used to measure the amount of alcohol in a person's system. The first example shows how law enforcement uses breathalyzers to enforce DUI laws and keep the roads safe. The second example shows how individuals can use breathalyzers to make responsible decisions about their own alcohol consumption and driving.