BAT Device Technology & Operation Principles 3

Question 1

Mouth alcohol can falsely elevate a breath test result. Which observation during the 15–20 minute deprivation period most directly addresses this concern?

Accepted Answer

Confirming the subject has not regurgitated, belched, or introduced any substance into the mouth

Answer

The observation period is designed to detect any event — vomiting, belching, or oral intake — that could introduce residual mouth alcohol and inflate the breath alcohol reading.

Question 2

How does ambient temperature affect the partition ratio assumption used in breath testing devices?

Accepted Answer

Both B and C may occur depending on whether the chamber heater is functioning

Answer

If the chamber heater fails, low ambient temperatures can cause condensation (understating BAC), while a malfunctioning thermostat at high temperatures may shift the partition ratio assumption and overstate BAC.

Question 3

What distinguishes an evidential breath testing instrument from a preliminary alcohol screening (PAS) device?

Accepted Answer

Evidential devices are approved for court-admissible results and require operator certification; PAS devices are used for probable cause screening only

Answer

Evidential instruments (e.g., Intoxilyzer, Datamaster) meet strict regulatory standards for accuracy and are used to produce legally admissible BAC results, whereas PAS devices serve only as field screening tools.

Question 4

A subject with uncontrolled diabetes has elevated ketones (acetone) in breath. How do modern evidential IR devices address this potential interference?

Accepted Answer

They use a wavelength specific to acetone to subtract its contribution from the ethanol reading

Answer

Modern IR analyzers sample multiple wavelengths or use an acetone-specific channel to detect and subtract acetone interference, preventing a false-positive ethanol reading.

Question 5

On the Intoxilyzer 8000, what is the significance of the 'invalid sample' result during a breath test sequence?

Accepted Answer

The device detected that the breath sample did not meet volume or flow criteria for a valid alveolar sample

Answer

An 'invalid sample' result indicates the subject's breath delivery did not satisfy the instrument's criteria (minimum volume, flow pattern) needed to ensure the sample represents deep lung air.

(BAT) Breath Alcohol Technician Certified Practice Test

(BAT) Breath Alcohol Technician Certified Practice Test

BAT Device Technology & Operation Principles 3