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Related Experiment Videos

Duplicate breath testing: some statistical analyses.

R G Gullberg1

  • 1Washington State Patrol, Crime Laboratory Division, Seattle 98104.

Forensic Science International
|May 1, 1988
PubMed
Summary
This summary is machine-generated.

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Duplicate breath alcohol testing ensures reliable results. Analysis of 1847 tests shows differences between samples are not linked to alcohol level but to how the sample was provided.

Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Duplicate breath alcohol testing is standard practice for result validation.
  • Jurisdictions often mandate two breath samples to ensure accuracy.
  • Washington State recently adopted an infrared breath testing program requiring duplicate samples.

Purpose of the Study:

  • To statistically analyze the results of duplicate breath alcohol tests.
  • To determine the relationship between the first alcohol result and the difference between duplicate tests.
  • To investigate factors influencing the agreement between two breath alcohol samples.

Main Methods:

  • Statistical analysis of 1847 duplicate breath tests.
  • Analysis of three variables: first alcohol result (ALC1), absolute difference (DIFFA), and signed difference (DIFFS).

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  • Regression analysis of absolute difference against the first alcohol result.

    • Main Results:

    • The first breath alcohol result (ALC1) ranged from 0.021 to 0.338 g/210 L (mean 0.157 g/210 L).
    • The absolute difference (DIFFA) between samples ranged from 0.00 to 0.05 g/210 L.
    • Regression analysis showed poor linear correlation (r = 0.212) between ALC1 and DIFFA.

    Conclusions:

    • The variability in duplicate breath alcohol tests is not significantly dependent on the subject's blood alcohol concentration.
    • Differences between duplicate breath samples are more likely related to the sample provision process.
    • These findings support the importance of standardized breath sample collection techniques.