Understanding Breath and Blood Tests

If you or a family member has been accused of driving under the influence of alcohol or drugs, or other offenses that may involve chemical testing for the presence of substances in breath or blood, very serious penalties may apply. A knowledgable criminal and DUI lawyer familiar with the applicable forensic science and Chicago area rules of Illinois law are a must.

Breath Tests

One of the primary tests used to determine a driver's blood alcohol content (BAC) is the breath test, commonly called a Breathalyzer test. This test is administered at the scene by law enforcement and is supposed to measure the amount of alcohol in the deep lung region. While the results of these tests are often used by prosecution, this method of measuring a driver's BAC is often very flawed. In many cases, the arresting officer improperly administers the test, and the machines are known to malfunction if they do not receive routine maintenance.

Blood Tests

The other test commonly used to determine BAC is a blood test. The driver's blood is drawn at the police station or an approved laboratory. The sample is then analyzed by a trained technician to determine the driver's BAC. This evidence is not foolproof, as laboratory staff can contaminate the sample by a failure to follow standard procedures, mislabeling the samples, or making other mistakes.

How can an attorney help me?

You can be assured that if there were any such mistakes in your case, our attorneys will find them. At Fagan, Fagan & Davis, we have over 100 years of combined experience in defending criminal and DUI matters. We have successfully challenged breath and blood tests in Chicago area courts and are prepared to challenge the allegations made against you. Call on us now for help if the evidence against you includes a breath or blood test.