Utah Law Enforcement Officer (LEO) Practice Exam

The principle of "stop" in breath testing refers to recognizing the test completion after the breath sample has reached a plateau. In this context, the plateau indicates that the breath alcohol concentration has stabilized, meaning that further breath samples would not provide additional relevant data since the levels have leveled off. This is important for ensuring the accuracy and reliability of the test results. Properly identifying when a plateau occurs allows law enforcement officers to determine that sufficient data has been collected, leading to an accurate assessment of a person’s blood alcohol concentration.

The other options do not accurately describe this principle. The cessation of the test at any time, discontinuation due to pressure, or a specific timing in seconds like ending the test after five seconds does not focus on the critical aspect of monitoring the stability of the breath sample, which is essential for ensuring the results' validity.