What is the main purpose of the PBT test?

The primary purpose of the Preliminary Breath Test (PBT) is to gauge immediate impairment before an arrest. This roadside test allows law enforcement officers to assess whether a driver is under the influence of alcohol at the time of the traffic stop. It provides a quick and efficient way to gather probable cause for further investigation or potential arrest, allowing officers to make informed decisions based on the driver's level of impairment.

While confirming blood alcohol concentration (BAC) levels, providing court evidence, and determining license suspension periods are relevant aspects of alcohol-related charges and consequences, these functions take place after the initial encounter and arrest. The PBT is specifically intended as an initial screening tool to detect alcohol presence and assert a driver's state of impairment at the moment of interaction.