In order for the state to successfully use information gathered from blood, urine or breath testing, it must be sure the test is accurate. Blood alcohol testing is a complicated and technical chore. Because it is measuring small amounts of chemicals involved in a complicated chemical process, it is crucial for the state that the equipment be tested and calibrated frequently. It must also ensure that whoever administers the test follows all procedures exactly. This means that the person must have proper training, and if the law calls for it, re-certification at appropriate intervals. Because the test must be given under optimum conditions, the officer must arrange these conditions. There are many technical reasons why a given test could be inaccurate. The information contained in this message is general and should not substitute for the advice and counsel of a licensed attorney.