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Glossary DUI Terms Over 25 Years of Devoted Representation

Glossary of Legal Terms in DUI Cases

Drunk driving arrests, DUI / DWI arrests, cases involving driving under the influence of drugs (DUID), or the combination of alcohol and drugs, all of these cases have their own language that is used in the court system. There are special terms which are not readily understood by most people. The following are often-used (and not often easily understood) terms relating to DUI / DUID (driving under the influence of drugs) and other related criminal arrests:

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APS, or Administrative Per Se Law means:
In many states, there are two separate cases that arise from a single drunk driving arrest: the court case, and the Administrative Per Se, or APS case, with the Motor Vehicles Department. In cases where someone is arrested for a DUI or a related drunk driving charge, and gives a breath or blood test with results that are above the legal limit, the Motor Vehicles Department will take an administrative action against the driver. NOTE: In California, a driver has only 10 DAYS from the time of arrest to request a license hearing, or the state will revoke their license. That’s why it is critical to contact a DUI lawyer right away.

An organic compound commonly found in the breath that can be improperly read as alcohol by the Intoxilyzer.

The taking of alcohol from outside the body into the bloodstream. Peak absorption refers to the highest level of blood alcohol seen before blood alcohol content (BAC) begins to diminish.

Alcohol Gaze Nystagmus (AGN):
Gaze nystagmus caused by the effects of alcohol upon the nervous system.

The initial court proceeding, where someone arrested for DUI / DWI, drunk driving, or any related drinking and driving criminal charge is formally advised of the charges against them, and given an opportunity to enter a plea.

BAC Levels california:
Blood alcohol content. In most states, alcohol level may be determined by reference to breath alcohol level as well, without having to convert to blood alcohol level.

Breath alcohol level, or blood alcohol level. Today, many states will allow the prosecutor to try to prove the defendant’s guilt by direct reference to the breath alcohol level, rather than having to convert the breath alcohol level to blood alcohol level.

A portable machine utilized by law enforcement to measure the blood alcohol content (BAC) of suspected drunk drivers.

The ability of the body to metabolize alcohol, and eliminate it from the system through the functioning of the vital organs. The rate of burnoff will vary from person to person, and even be different for the same person depending upon various factors. This is just one of the reasons that retrograde extrapolation is such a difficult task, and why the results are uncertain.

Caloric Nystagmus:
A vestibular system nystagmus caused by differences in temperature between the ears, e.g., one ear is irrigated with warm water and the other irrigated with cold water.

Chemical Test:
As related to driving under the influence (DUI), a test of the alcohol or drug concentration in a person’s blood. Blood or urine tests are used if other drugs are suspected.

Usually, ability to exert control over the vehicle. Officers usually need not observe someone driving in order to arrest them for DUI / DWI or any drunk driving arrest. Circumstantial evidence of driving is typically sufficient to establish this element.

Driver’s License Suspension:
The temporary withholding of driving privileges. A DUI offender’s license is withheld for a given period, then returned when and if specific conditions have been met.

Drunk Driving:
A general reference to those criminal cases that are called DUI, DWI, DUII, or other acronyms. They generally describe two types of cases: first, where the driver is sufficiently impaired by alcohol, drugs, or a combination of the two, that the driver cannot drive safely. Second, “drunk driving” relates to those cases where someone is above that state’s legal limit, usually .08, no matter how safely the person is driving.

Legal Definition of DUI:
Driving under the influence. Can either refer to driving under the influence of alcohol, driving under the influence of drugs, or driving under the influence of a combination of liquor and drugs. This is the most widely used acronym for drunk driving cases. The standard for what it means to be under the influence will vary from state to state. It is important to contact a lawyer in your area that knows DUI law if you have been accused of DUI or a related drunk driving offense.

Driving under the influence of Drugs. For purposed of DUID, the drugs may be legal or illegal, prescribed or otherwise.

What does DUII stand for:
Driving under the influence of an intoxicant. The intoxicant in DUII cases can be either alcohol or other drugs. What's the difference between DUI and DUII? There is no difference between a charge of DUII and DUI. A DUII charge is no more or less serious than that of DUI.

Driving while intoxicated, or driving while impaired. Like DUI, DWI can refer to driving while intoxicated or impaired as the result of either drinking alcohol or taking drugs, or both. This is the second most widely used acronym for drunk driving cases. Like DUI, the question of how to define being intoxicated or impaired is at the heart of a drunk driving case in jurisdictions that use DWI. It is critical to consult with a DWI lawyer in your area that understands these sophisticated issues.

Driving while under the influence is a phrase that is infrequently used to refer to drunk driving cases. When this acronym is used, it refers to driving under the influence of alcohol, driving under the influence of drugs, or driving under the influence of a combination of alcohol and drugs.

Those factors that can operate to increase the punishment in a drunk driving, DUI, DWI, or related driving under the influence case. These enhancements may include driving above a certain speed while DUI, having minors in the car while drunk driving, having a BAC above a certain level (.20, for example), refusing to take a chemical test after being arrested for DUI, being involved in a traffic accident while DUI or DWI, or having prior convictions for DUI, DWI, or a related drunk driving offense.

Epileptic Nystagmus:
Nystagmus evident during an epileptic seizure.

The method of computing BAC at a given time using physical characteristics of the drinker, the quantity of alcohol consumed, the period of time over which alcohol is consumed, and when the alcohol was last consumed.

Field Sobriety Test (FST):
Any number of tests used by law enforcement officers, usually on the roadside, to determine whether a driver is impaired. Most FSTs test balance, coordination and the ability of the driver to divide his or her attention among several tasks as once. Other tests, such as the horizontal gaze nystagmus test, are used to measure a subject’s impairment level.

Felony drunk driving:
Under certain circumstances the misdemeanor offense of driving under the influence of alcohol will be treated as a felony, such as when drunk driving results in great bodily harm or death or where the accused has three or more prior DUI convictions. (Note that certain related charges, such as “wet reckless” driving may count as a prior DUI conviction for this purpose.)

Ability of the eye to focus on one point.

Gaze Nystagmus:
Nystagmus that occurs when the eyes gaze or fixate upon an object or image. Usually caused by a disruption of the nervous system.

Horizontal Gaze Nystagmus (HGN):
Gaze nystagmus that occurs when the eyes gaze or move to the side along a horizontal plane.

High BAC:
Threshold blood alcohol content for which maximum penalties and fines may apply, even on a first offense. In California, the court may consider a BAC of .20 as a special factor in imposing enhanced sanctions and determining whether to grant probation and may give high BAC “heightened consideration” in ordering an ignition interlock up to three years. In counties with licensed alcohol education/counseling program, offenders placed on probation with high BAC must participate in program for at least six months vs. three months.

Impairment or Intoxication:
Those states that refer to Driving While Intoxicated (DWI) or Driving While Impaired (DWI) usually have definitions that are similar to being under the influence. Each state has a different standard, so it is extremely important to contact a drunk driving lawyer in the state where you were arrested.

Ignition Interlock Device:
Located inside a vehicle and near the driver’s seat, an ignition interlock device is an in-car alcohol breath screening device that prevents a vehicle from starting if it detects a blood alcohol concentration (BAC) over a pre-set limit of .02 (i.e., 20 mg of alcohol per 100 ml of blood). The device is connected to the engine’s ignition system. Many states require that the device be used by those convicted of driving under the influence (DUI).

Jerk Nystagmus:
Nystagmus where the eye drifts slowly away from a point of focus and then quickly corrects itself with a saccadic movement back to the point of focus.

License Revocation:
A license revocation means your driving privileges have been cancelled. You will likely need to reapply for a driver’s license after a designated length of time.

Asking the court to do something. DUI defense lawyers will usually file many motions with the court in defending a driver accused of DUI, DWI, or a related drunk driving offense. These motions may include discovery motions (to force the prosecutor to turn over evidence), motions to suppress evidence, motions to dismiss the case, and many others.

National Highway Traffic Safety Administration (NHTSA):
The agency within the United States Department of Transportation that administers traffic safety programs. NHTSA’s duties include funding studies on field sobriety tests and training law enforcement officers in the administration of the standardized field sobriety test battery.

Natural Nystagmus:
Nystagmus that occurs without any apparent physiological, vestibular, or neurological disturbance. Natural nystagmus occurs in approximately 2%-4% of the population.

Neurological Nystagmus:
Nystagmus caused by some disturbance in the nervous system.

Not Guilty:
The verdict you hope to hear in your DUI, DWI, or drunk driving case after being represented by one of our well-qualified DUI defense lawyers.

An involuntary bouncing or jerking of the eye caused by any number of vestibular, neurological or physiological disturbances.

Movement of the eyeball.

Odor of Alcohol on Breath:
The most dependably recurring comment in an officer’s report after stopping someone for a suspected DUI. While alcohol itself has little or no odor, the odor of the flavorings can be deceptive as to the strength or amount consumed and is subjective.

One-Leg-Stand (OLS) Test:
One of the three tests that make up the Standardized Field Sobriety Test Battery. This test requires a subject to stand on one leg, look at his or her foot and count out loud to thirty. The subject is assessed on the ability to understand and follow instructions, as well as the ability to maintain balance for thirty seconds.

Optokinetic Nystagmus:
A nystagmus (jerky eye movements) evident when an object that the eye fixates upon moves quickly out of sight or passes quickly through the field of vision, such as occurs when a subject watches utility poles pass by while in a moving car. Optokinetic nystagmus is also caused by watching alternating moving images, such as black and white spokes on a spinning wheel.

To move back and forth at a constant rate between two points.

PAS Test:
Preliminary Alcohol Screening Test. Generally used in the field for DUI stops by law enforcement, where a hand-held unit gauge the BAC level through a breath test

Pathological Disorder:
Disruption of the normal functions of organs of the body due to disease, illness, or damage. GERD and reflux are examples of involuntary disruptions of the GI that can result in inaccurate breath tests.

Pendular Nystagmus:
Nystagmus where the eye oscillates or swings equally in two directions.

Per Se Laws:
Laws that declare it illegal to drive a vehicle with a blood alcohol level content above a certain alcohol level, as measured by a blood or breath test. In most states, the per se limit is .08% or greater. Violating the per se law has nothing to do with one’s ability to drive a car safely; it is based solely on body chemistry. The only question is whether the driver was above the legal limit at the time of driving. NOTE: Since breath or blood testing always takes place after the time of driving, it does not directly answer the question of BAL at the time of driving. The alcohol level at the time of testing may be higher, lower, or the same, when compared to the time of driving.

Physiological Nystagmus:
A nystagmus(jerky eye movements) that occurs so that light entering the eye will continually fall on non-fatigued cells on the retina. Physiological nystagmus is so slight that it cannot be detected without the aid of instruments, and it occurs in everyone.

Positional Alcohol Nystagmus (PAN):
Positional nystagmus when the foreign fluid is alcohol.
PAN I — The alcohol concentration is higher in the blood than in the vestibular system.
PAN II — The alcohol concentration is lower in the blood than in the vestibular system.

Positional Nystagmus:
Nystagmus that occurs when a foreign fluid is in unequal concentrations between the blood and the fluid in the semi-circular canals of the vestibular system.

Post-rotational Nystagmus:
Nystagmus caused by disturbances in the vestibular system fluid when a person spins around. Post-rotational nystagmus lasts for only a few seconds after a person stops spinning.

Provisional (or Restricted) License:
A provisional driver’s license typically denies certain license privileges. For instance, in a DUI context, an individual with a provisional license will only be allowed to drive to and from work.

Reasonable Doubt:
Before someone may be found guilty of DUI or DWI, the jury (or judge in a bench trial) must be convinced of the defendant’s guilt beyond a reasonable doubt. It represents the highest legal standard in our country. There is a presumption of innocence, and requires that the state prove each element of a DUI charge beyond a reasonable doubt, with a (juror’s) abiding belief that the charge is true.

Resting Nystagmus:
Nystagmus that occurs as the eyes are looking straight ahead.

Retrograde Extrapolation:
This is the scientific term for the ability to look atan individual’s alcohol level at the time of testing, and look backwards to determine what the alcohol level was at the time of driving.

Reckless Driving:
Operating a motor vehicle in a dangerous manner, including speeding, weaving in and out of traffic, and similarly hazardous patterns. Reckless driving is one of several potential grounds for increased DUI penalties.

Rising Alcohol Defense:
This defense is based on the idea that alcohol levels change over time, as the body absorbs alcohol, reaches a peak level, and then eliminates alcohol. Breath or blood testing is done after driving (sometimes long after); these test results tell us what the alcohol level is at the time of testing, not at the time of driving. The rising alcohol defense is simply that at the time of driving (the critical time in a drunk-driving case), the alcohol level was below the legal limit, even if it continued to rise until the time of testing.

Rotational Nystagmus:
Nystagmus caused by disturbances in the vestibular system fluid when a person spins around. Rotational nystagmus occurs while the person is spinning but it dissipates when the person stops spinning.

Movement of the eye from one fixation point to another.

Sobriety Checkpoints:
The practice of law enforcement agencies of selecting a particular location for a particular time period and systematically stopping vehicles (for example, every fifth car) to investigate drivers for possible DUI / DWI.

Smooth Pursuit:
The eye’s course as it tracks a moving image.

Southern California Research Institute (SCRI):
A research organization that conducted the first two research studies that eventually produced the Standardized Field Sobriety Test Battery. SCRI has conducted subsequent field sobriety test validation studies as well as drug recognition evaluation studies.

Standardized Field Sobriety Test (SFST):
A group of tests selected as the best field sobriety tests to increase the ability of law enforcement officers to detect driver impairment. The results of this battery, usually administered along the roadside, contribute extensively to a law enforcement officer’s decision to arrest a person for impaired driving.

As it relates to DUI / DWI, the ability of a person to adapt and maintain their behavior to disguise the effects of alcohol consumption.

Under the Influence:
In California, the jury instruction issued by the court says: “A driver is not necessarily ‘under the influence’ just because he or she has consumed some alcohol [or drugs]. A driver is ‘under the influence’ when he or she has consumed an amount of alcohol [or drugs] that impairs his or her ability to drive in a reasonably careful manner.”

A motor vehicle, car, truck, motorcycle. In some states, a DUI, DWI or drunk-driving conviction can result from driving a bicycle, riding a horse, driving a snowmobile, or even a motorized wheelchair.

Vertical Nystagmus:
Nystagmus that occurs when the eyes gaze or move upward along a vertical plane.

Vestibular System:
The system of fluid-filled canals located in the inner ear that assists in balance, coordination and orientation.

Vestibular System Nystagmus:
Nystagmus(jerky eye movements) caused by a disturbance in the vestibular system.

Vehicle Impound/Immobilization:
In California, if you are driving with a suspended or revoked driver’s license, the vehicle you are driving may be impounded for 30 days and possibly even forfeited.

Voir Dire:
Jury selection. In those states that allow a jury trial for drunk-driving cases, either the lawyers or the judge (or both) will question potential jurors about their background and qualifications to sit as jurors in the case. This process is called voir dire, and is extremely important in defending a DUI, DWI, or related drunk-driving case. Both the prosecution and the defense are entitled to fair and unbiased jurors, in those states that allow jury trials in DUI, DWI, or drunk driving cases. Voir dire is the process by which the parties learn about the potential jurors, and determine whether or not the drunk-driving case is a proper one for the potential juror to hear.

Walk-and-Turn (WAT) Test:
One of the three tests that make up the standardized field sobriety battery. This test requires a person to take nine heel to toe steps down a straight line, turn and take nine heel-to-toe steps back up the line. The subject is assessed on the ability to understand and follow instructions as well as the ability to maintain balance during the instruction stage and walking stage.

Wet Reckless:
Plea to a charge of reckless driving which was “alcohol related.” A wet reckless results from a plea bargain to reduce a charge of drunk-driving. There are several reasons for such a reduction, including a borderline blood alcohol level, where there was no accident and no prior record. The result is a lower fine, no jail time and no record of a drunk-driving conviction, but if there is a subsequent drunk-driving conviction the “wet reckless” will be considered a “prior” drunk-driving conviction and will result in a heavier sentence required for a second conviction. The chief benefits of a wet reckless are realized on a second-offense (or greater) DUI conviction; there are only marginal benefits when charged with a first offense. A wet reckless can be especially important to anyone who holds a professional license, since this is only reported on a criminal record as a reckless driving offense. It is vital that you consult with a criminal defense DUI lawyer before accepting any such plea.

A person who can provide testimony on behalf of the prosecution or DUI defense.

Zero Tolerance BAC:
Allowable blood alcohol content for minors (as defined by the state). In California, this law states that it is against the law to drive with a blood alcohol concentration (BAC) of .01% or higher if you are under 21 years of age. Your BAC is measured by a test given to you by a police officer. Under this law, on your first offense, your driving privilege will be suspended for one year if:

  • your BAC is .01% or higher, or
  • you refuse to take the preliminary alcohol screening (PAS) test, or
  • you fail to complete the PAS test
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