However, as we will explain later, breath analyzers (commonly called breathalyzers) are in fact frequently inaccurate.

Other factors that can affect a breath analyzer's measurement include:

South Dakota doesn't allow readings from any type of breath analyzer, handheld or otherwise.

Breathalyzer is just one type of breath analyzer that is commonly used.

The main problem with breath analyzers is that they only estimate how much alcohol is in a person's blood.

Employers would be required to conduct the tests with the same breath analyzers that highway patrols use to test for drunken driving.

Control module measures strength of electrical impulse from breath analyzer to determine blood alcohol concentration.

But in the last 16 months, five more districts have tried to incorporate the use of breath analyzers into school policies.

Administrators said the breath analyzer is an objective tool that can document drinking, even when students and parents say they haven't been.

Each time a driver wants to start a car, he or she must blow into a breath analyzer that is connected to the ignition.