Officers must follow precise protocols set by the National Highway Traffic Safety Administration (NHTSA). Failing to give clear instructions or conducting tests on uneven ground can invalidate the results.
Diabetes can cause "ketosis," where the breath smells fruity or like alcohol, and the liver produces ketones that trick breathalyzers. dui defense strategies
Issues with the "chain of custody"—how the blood was collected, stored, and transported—can cast doubt on its validity. For instance, using an alcohol swab to clean the draw site can contaminate the sample. 4. Alternative Explanations for Impairment Symptoms Officers must follow precise protocols set by the
FSTs—like the walk-and-turn or one-leg stand—are highly subjective and notoriously prone to error. Issues with the "chain of custody"—how the blood
Breathalyzers and blood tests are not infallible and must meet specific technical standards.
Residual alcohol in the mouth from burping, vomiting, or using mouthwash can cause falsely high breathalyzer readings. Conditions like acid reflux (GERD) can also cause this phenomenon.