What can cause a false BAC reading?

4 reasons breathalyzer tests give false-positive readings

You took the test too quickly after drinking. Breathalyzer tests measure the concentration of alcohol in your bloodstream.
Officers did not calibrate the test correctly.
You ate certain foods.
You have certain medical conditions.

Can a BAC test be wrong?

Blood alcohol tests are very accurate in determining BAC levels, but in some cases, the results may be misleading. These cases may involve: People with diabetes or high blood ketones.

Are BAC tracks accurate?

BACtrack Most Accurate in Independent Tests Several reporters have tested commercially available breathalyzers against the police gold-standard breathalyzer unit and found BACtrack is the most accurate.

Why breathalyzers are not accurate?

Breathalyzers do not actually measure the alcohol level in a person’s blood. Instead, they measure the alcohol in the air, and a formula is used to convert that reading into an estimate of the person’s blood alcohol level. However, breathalyzers cannot distinguish between alcohol and many other compounds.

Why is a breath test not accurate for a DUI?

Reasons that a breath test might not accurately reflect someone’s blood alcohol concentration (“BAC”) include: A phenomenon such as residual mouth alcohol or rising blood alcohol wrongly inflated a defendant’s BAC level. 1. When is a breath test given in a DUI case?

When do you get a pas test for a DUI?

Preliminary alcohol screening (“PAS”) tests A preliminary alcohol screening (PAS) test is given during a DUI investigation. This occurs after someone has been pulled over or stopped at a DUI checkpoint, but before a DUI arrest has been made. A PAS is typically given on a hand-held breath testing instrument, such as a Breathalyzer.

How does the prosecutor calculate your BAC for a DUI?

The prosecutor must prove what your BAC was at the time of driving, rather than just at the time of the test and they do this by having their expert calculate your BAC based on the time of your last drink. Prosecutorial experts will typically use retrograde extrapolation for this calculation. What time were you originally pulled over?

What’s the legal BAC for driving under the influence?

If your blood alcohol concentration is still rising, then the result on the breath test is not necessarily indicative of what your bac was at the time of driving. Under the law, it is a rebuttable presumption that you were under the influence if your BAC is 0.08% 4.

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