SFST Alcohol Influence and Physiological Effects 3

Question 1

Under federal regulations, the per se BAC limit for operators of commercial motor vehicles (CMV) is:

Accepted Answer

0.04%

Answer

Federal law (49 CFR Part 382) sets the BAC limit for CMV operators at 0.04%, half the standard adult limit, due to the increased public safety risk posed by large commercial vehicles.

Question 2

Under most U.S. zero-tolerance laws, drivers under the age of 21 may be charged with DUI at a BAC of:

Accepted Answer

0.02% or higher

Answer

Most states have adopted zero-tolerance laws setting the BAC limit for drivers under 21 at 0.02% (effectively zero), reflecting that any alcohol consumption by minors is illegal.

Question 3

The forensic technique of 'retrograde extrapolation' refers to:

Accepted Answer

Calculating what a person's BAC was at an earlier time based on a later chemical test result

Answer

Retrograde extrapolation uses elimination rate formulas to work backward from a known BAC (measured at testing) to estimate what BAC was at the time of driving.

Question 4

Carbonated mixers (such as tonic water or cola) typically have what effect on alcohol absorption?

Accepted Answer

They speed up alcohol absorption into the bloodstream

Answer

Carbonation increases gastric pressure and speeds gastric emptying, causing alcohol to enter the small intestine faster and resulting in more rapid absorption.

Question 5

Alcohol is distributed throughout the body primarily via body water because:

Accepted Answer

Alcohol is water-soluble and distributes through total body water

Answer

Alcohol is highly water-soluble and distributes evenly throughout the body's total water content, which is why body composition (water vs. fat percentage) affects BAC.

(SFST) Standardized Field Sobriety Testing Certified Practice Test

(SFST) Standardized Field Sobriety Testing Certified Practice Test

SFST Alcohol Influence and Physiological Effects 3