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One of the most common ways for a police officer to determine if you are driving under the influence is to administer a breath analysis test. These machines purport to measure the blood-alcohol content when a person breathes into it. Often a defendant in a Tennessee Drunk Driving case has a chance to challenge the validity of a breath test. An experienced attorney, along with scientific experts when necessary, can go a long way to casting doubt on the validity of a breath test. In many cases, the test is administered improperly and can result in having the results inadmissible in Court. Or if they are admissible, serious doubt can be cast on the validity of the results. Here are some common arguments a DUI attorney could make to question the breath-test results: * The result was skewed by external factors related to the driver. These can include diseases or conditions such as diabetes, bronchitis, fever, ketosis, asthma, shock, and dental conditions. Also hiccupping, vomiting, hyperventilating, or burping can affect the test. * The person administering the test has never been properly trained to do so. Read about common police DUI mistakes.