Most drivers have heard of breath tests, and the use of the Intoxilyzer machine when suspected of DUI. While this test can provide important evidence for the prosecution, it is at times not allowed as evidence in a drunk driving case. It is important to confirm a number of requirements imposed upon officers were properly adhered to before the breath test results are allowed to be used in court. These requirements include: 1. that proper procedures were followed; 2. the operator of the breath test machine was properly certified to perform the test; and 3. the accuracy of the machine has been certified.