Manipulation of Breath Alcohol Tests: Can Specific Techniques Alter Breath Alcohol Content?

OBJECTIVE

The most common form of measurement of breath alcohol content (BrAC) is through the use of a diode catheter. This study aims to test the accuracy of breath alcohol analysis through different manipulations.

METHODS

BrAC was measured after individuals consumed each standardized beer until they reached a 0.1 BrAC. Then, the individuals were breath analyzed while not providing full effort, using the side of their mouths, immediately after hyperventilating, 5 and 10 min after hyperventilation, immediately after a sip of water, and 5 min after that water.

RESULTS

There were 54 individuals. Two baselines were used as the controls. The first baseline was a mean BrAC of. 104 with standard deviation of +0.008 for poor effort, side of mouth, and hyperventilating. The second baseline used for drinking water manipulations was a BrAC of 0.099 + 0.11. Poor effort (mean + standard deviation: 0.099 ± 0.10, < 0.0001), immediately after hyperventilating (0.086 ± 0.011, < 0.0001), 5 min after hyperventilating (0.099 ± 0.009, < 0.0001), and 10 min after hyperventilating (0.099 ± 0.011, < 0.0001) were all found to be statistically significant in their ability to lower BrAC. Both immediately after water (0.084 ± 0.011, < 0001) and 5 min after drinking water (0.096 ± 0.13, < 0.0001) were found to have significantly altered the BrAC.

CONCLUSION

Our research shows that manipulations can alter BrAC readings significantly. Breath analyzer operators should be cognizant of these methods that may lead to falsely lower BrAC readings.