BAT Result Interpretation & Analysis 3

Question 1

On a breath alcohol test record, the notation 'AIR BLANK PASS' indicates:

Accepted Answer

The instrument detected no residual alcohol in its own air path before sampling

Answer

An air blank purges and checks the instrument's internal air path to confirm no residual alcohol remains from a prior test.

Question 2

Which of the following best describes 'mouth alcohol' in the context of breath testing?

Accepted Answer

Alcohol in the oral cavity from recent drinking, belching, or regurgitation that has not been cleared

Answer

Mouth alcohol is residual alcohol trapped in the oral cavity that can falsely elevate BrAC if the observation period was inadequate.

Question 3

A subject's two sequential BrAC readings are 0.114 and 0.118 g/210L. What is reported?

Accepted Answer

0.114 g/210L (the lower result)

Answer

When both results are valid (within 0.020 of each other), the lower of the two readings is reported as the official BrAC.

Question 4

What is the primary purpose of the mandatory observation period before a breath alcohol test?

Accepted Answer

To ensure the subject has not introduced any foreign substances into the mouth that could affect the result

Answer

The observation period (typically 15-20 minutes) ensures mouth alcohol from drinking, belching, or regurgitation dissipates before sampling.

Question 5

Acetone in the breath of a diabetic subject could cause a falsely elevated reading on which type of instrument?

Accepted Answer

Infrared spectroscopy instruments operating at the 9.5 micron wavelength

Answer

Older or poorly designed infrared instruments may mistake acetone's absorption spectrum for ethanol; modern instruments use multiple wavelengths to differentiate.

(BAT) Breath Alcohol Technician Certified Practice Test

(BAT) Breath Alcohol Technician Certified Practice Test

BAT Result Interpretation & Analysis 3