Experienced Utah DUI Attorney Explains Intoxilyzer and Field Sobriety Tests
Understanding the machines used for DUI testing
Field sobriety tests use devices that estimate your blood alcohol content (BAC) from a sample of your breath. Some of the more common brand names for such devices include Breathalyzer, Intoxilyzer, Alcosensor, Alcotest and Breathkey. All of these devices serve the same purpose and provide primary evidence in many DUI arrests. If you are going to mount a solid defense against a DUI arrest, you must understand these tests, how they work and their common faults. An experienced DUI law firm, such as the Law Offices of Carl N. Anderson, III, PLLC in Salt Lake City, can provide these explanations. Carl N. Anderson, III is actually qualified to administer the Standardized Field Sobriety Tests (SFST) and teach and evaluate law enforcement on proper SFST administration.
What’s A Field Sobriety Test?
Field sobriety tests are a set of physical exercises that police use to justify arrest. People who are stone cold sober fail these tests every day. They include:
- Standing on one leg without falling over
- The walk-and-turn test, to see if you can move in a straight line
- Touching finger to nose
- The horizontal gaze test, sometimes using a penlight
- The ability to count on your fingers
- Finger tracing coordination
A poor performance in a field sobriety test may be the result of any number of factors not related to consuming alcohol or drugs. Environmental conditions such as poor lighting, an uneven surface and weather may affect your performance. Your own physical condition such as fatigue, nervousness, depression, or prescription medication may also affect your ability to perform some parts of the test, but not necessarily your ability to drive safely.
The Reality Behind Field Sobriety Tests
The first field sobriety test was invented in 1954 by an Indiana State Police Captain named Robert Borkenstein, who eventually became a doctor and a professor at Indiana University at Bloomington. This invention allowed law enforcement a non-invasive way to immediately determine the BAC of a DUI suspect.
One thing the field sobriety tests have never been able to determine, though, is the level of intoxication of a subject. Due to gender, weight, race and other factors, different people react in different ways to the same BAC test, and the results often vary between individuals who consume the same amounts of alcohol.
Today, BAC tests estimate the BAC of subjects indirectly by measuring the amount of alcohol in their breath through one of two technologies:
- Infrared spectrophotometer technology
- Electrochemical fuel cell analysis — a less accurate method often used in the field as a sort of preliminary breath test
Common Problems with BAC Tests
Field sobriety tests are subject to numerous failures and errors, all of which can form the basis of a legal DUI defense or the pursuit of reduced charges for DUI. These errors include:
- Temperature, which affects field sobriety test results tremendously, both in terms of atmospheric temperature and the body temperature of the subject
- Some tests assume a certain baseline volume of alcohol in the bloodstream when in reality this presumed constant varies wildly in adults
- Breathing patterns impact the accuracy of a breathalyzer test
- Law enforcement officers frequently misuse field sobriety devices or fail to maintain or calibrate these devices correctly
- Breathalyzer tests do not account for drug or narcotic-based DUIs
More Articles To Help You Understand Field Sobriety Tests
Unparalleled experienced fighting DUI charges and understanding field sobriety tests
Utah attorney Carl N. Anderson, III started out as a Nebraska County attorney, where he gained considerable experience litigating cases involving DUIs, field sobriety tests and other elements of traffic stops. Let him put that experience to work for you. Contact the Law Offices of Carl N. Anderson, III, PLLC online or at 801-285-0303. He is licensed to practice law in Utah, Colorado and Nebraska.
Carl N. Anderson, III can help residents of Utah, Colorado and Nebraska. Credit Cards OK ∙ Free Initial Consultations ∙ Aquí Se Habla Español. Contact him online or at 801-285-0303 to arrange a free consultation today.