A preliminary breath test (PBT) is considered a field sobriety test. The purpose of this test is to determine if an officer has probable cause to make a Driving Under the Influence (DUI) arrest. The officer may will ask a suspected intoxicated driver to blow into a Breathalyzer or PBT Machine. This machine reads the level of alcohol in the person's system.

In the State of Michigan, the legal alcohol limit for driving is 0.08; however, an arrest for intoxicated driving can happen with any amount of alcohol in a person's system. If a suspected drunk driver refuses to submit to a PBT, it will result in a one year suspension of driving privileges.

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