Common Reasons For Breathalyzer Tests To Over Estimate BAC Levels

If you are suspected of driving under the influence of alcohol (DUI) in Middle Tennessee, the law-enforcement officer will likely request you to submit to a test to determine your blood alcohol concentration (BAC) level. The Metro Nashville Police Department uses two different types of breath alcohol machines, the EC/IRII and the Alcohol Sensor V.

There are some common reasons for breathalyzer tests to over estimate the true BAC level:

  • Long breath holding prior to breathing into the machine.
  • Long exhalation time in breathalyzer, as well as burping.
  • Testing during absorption phase.
  • Presence of mouth alcohol or alcohol in stomach gases reaching the mouth, a medical condition commonly called acid reflux.
  • Elevated body temperature.
  • Presence of an interfering substance, such as acetone, which may be present in the breath of diabetics and people on high-protein diets.

All of these variables must be considered when defending a DUI charge in Middle Tennessee. A skilled and experienced DUI defense attorney would minimize the prosecution's "scientific" guessing and presentation of unreliable and inaccurate evidence.