Chemical Test Presumptions in Drunk Driving Cases

If you have ever been arrested for drunk driving you were probably given some sort of chemical test to determine your blood alcohol content. The most common chemical tests include a breath test or blood test. Many jurisdictions have statutes that allow prosecutors to give presumptive effect to chemical test readings of blood-alcohol content. In other words, if a person's blood alcohol content is at a certain level, the court will presume automatically that the person was driving under the influence of alcohol. Depending on the jurisdiction, some statutes will use the word "presumption," while others use the term "prima facie evidence."

Elements of Drunk Driving Offense

Drunk driving laws were enacted almost at the same time as the motor vehicle was invented. Over the years the statutes have been changed and strengthened. In 1982, legislation was passed requiring state drunk driving laws to include provisions for a blood-alcohol level of 0.10 as a per se offense and for license suspensions and minimal sentencing restrictions in order for states to continue to qualify for certain federal funding. Legislation passed in 2000 conditioned the availability of federal highway funds upon the states' adoption of a limit of 0.08.

Pre-Sentencing Alcohol Evaluations in DUI/DWI Cases

Most state laws governing driving under the influence (DUI) and/or driving while intoxicated (DWI) mandate that offenders receive intervention and treatment. According to these laws, if an offender is convicted of DWI/DUI, the offender is required to obtain a clinical substance abuse assessment to determine whether he or she will be recommended to complete a substance abuse education class or treatment program.

Overview of Open Container Laws

In 1998, as part of the Transportation Equity Act for the 21st Century Restoration Act, a federal program was created to encourage states to enact laws prohibiting the possession of alcohol in the passenger areas of motor vehicles. The federal program essentially provided that if states did not enact the so-called "open-container" laws, the states would be subject to a penalty transfer of federal highway construction funds to the state's safety grant program. Since the passage of the federal act, the vast majority of states have passed "open-container" laws that satisfy the federal requirements.

Criminal Offense of Failure to Use/Improper Use of Turn Signals, Headlights, and Emergency Flashers

In the exercise of its police power, a state may establish minimum equipment and usage standards for lighting equipment of motor vehicles, including headlamps, rear lighting, turn signals, and hazard warning lights.