Test Administration Flashcards

When using all three SFSTs together, what is the NHTSA-validated accuracy rate for identifying subjects at or above 0.08 BAC?

Answer: 91%

Using all three standardized tests together raises classification accuracy to approximately 91% per NHTSA validation studies.

Which phase of the Walk-and-Turn test evaluates the subject's ability to divide attention between mental and physical tasks simultaneously?

Answer: Both the instruction phase and walking phase

Both phases require divided attention: the instruction phase demands balance while processing directions, and the walking phase demands balance while counting and following rules.

During HGN testing, onset of nystagmus prior to 45 degrees is significant because it suggests:

Answer: A BAC likely at or above 0.08

NHTSA research links onset of HGN prior to 45 degrees strongly with a BAC at or above 0.08, making it the most predictive HGN clue.

A properly standardized HGN exam consists of how many total passes of the stimulus in front of the subject's eyes?

Answer: 8 passes

The standardized HGN examination involves 8 total passes: 2 for equal pupil size/resting nystagmus, 2 for smooth pursuit, 2 for maximum deviation, and 2 for onset prior to 45 degrees.

When the subject steps off the line during the Walk-and-Turn, the officer records a clue if the subject:

Answer: Steps any distance off the designated line

Any step off the line, regardless of distance, is recorded as a clue under NHTSA standardized scoring criteria.

Which statement accurately describes the 'hopping' clue during the One-Leg Stand?

Answer: The subject uses small hops on the standing foot to maintain balance

Hopping is recorded when the subject uses small hops on the standing foot to maintain balance rather than remaining stationary.

NHTSA recommends that officers practice SFSTs regularly to maintain proficiency. Which of the following best describes the purpose of this recommendation?

Answer: To ensure consistent, standardized administration that holds up in court

Regular practice maintains the standardized administration that is essential for test validity, officer credibility, and admissibility of evidence in court.