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al offense statutes to driving under the influence dui these dui statutes generally cover intoxication by any drug including alcohol such laws may also apply to operating boats aircraft farm machinery horse drawn carriages and bicycles specific terms used to describe alcohol related driving offenses include drinking and driving drunk driving and drunken driving most dui offenses are alcohol related so the terms are used interchangeably in common language and drug related dui is used to distinguish united kingdom edit in the united kingdom there are two separate offences to do with alcohol and driving the first is driving or attempting to drive with excess alcohol legal code dr10 the other is known as in charge of a vehicle with excess alcohol legal code dr40 or drunk in charge due to the wording of the licensing act 1872 5 6 in relation to motor vehicles the road safety act 1967 created a narrower offense of driving or being in charge of a vehicle while having breath blood or urine alcohol levels above the prescribed limits colloquially called being over the limit 7 these provisions were re enacted in the road traffic act 1988 a separate offense in the 1988 act applies to bicycles while the 1872 act is mostly superseded the offense of being drunk while in charge of any carriage horse cattle or steam engine is still in force carriage has sometimes been interpreted as including mobility scooters 6 european union edit in the european union the term drink driving is used in the directive eu 2015 413 of the european parliament and of the council of 11 march 2015 facilitating cross border exchange of information on road safety related traffic offences in this directive drink driving means driving while impaired by alcohol as defined in the law of the member state of the offence 8 measurement of intoxication edit main article blood alcohol content a law enforcement grade breathalyzer specifically an alco sensor iv depending on the jurisdiction a drunk driver s level of intoxication may be measured by police using three methods blood breath or urine resulting in a blood alcohol concentration bac breath alcohol concentration brac or urine result for law enforcement purposes breath analysis using a breathalyzer is the preferred method since results are available almost instantaneously a measurement in excess of the specific threshold level such as a bac of 0 08 8 basis points defines the criminal offense with no need to prove impairment 9 in some jurisdictions there is an aggravated category of the offense at a higher bac level such as 0 12 0 15 or 0 25 in many jurisdictions police officers can conduct field tests of suspects to look for signs of intoxication 10 there have been cases in canada where officers have come upon a suspect who is unconscious after a crash and officers have taken a blood sample citation needed with the advent of a scientific test for bac law enforcement regimes moved from field sobriety testing e g asking the suspect to stand on one leg to having more than a prescribed amount of blood alcohol content while driving however this does not preclude the simultaneous existence and use of the older subjective tests in which police officers measure the intoxication of the suspect by asking them to do certain activities or by examining their eyes and responses 11 the validity of the testing equipment methods for determining breath and blood alcohol and mathematical relationships between breath blood alcohol and intoxication levels have been criticized 12 improper testing and equipment calibration is often used in defense of a dui or dwi 13 effects of alcohol edit effects on cognitive processes edit main article short term effects of alcohol consumption a cctv still showing a drunk driver colliding with a security gate alcohol is a depressant which mainly affects the function of the brain alcohol first affects the most vital components of the brain and when the brain cortex is released from its functions of integrating and control processes related to judgment and behavior occur in a disorganized fashion and the proper operation of behavioral tasks becomes disrupted 14 alcohol weakens a variety of skills that are necessary to perform everyday tasks drinking enough alcohol to cause a blood alcohol concentration bac of 0 03 0 12 typically causes a flushed red appearance in the face and impaired judgment and fine muscle coordination a bac of 0 09 to 0 25 causes lethargy sedation balance problems and blurred vision a bac from 0 18 to 0 30 causes profound confusion impaired speech e g slurred speech staggering dizziness and vomiting a bac from 0 25 to 0 40 causes stupor unconsciousness anterograde amnesia vomiting and respiratory depression potentially life threatening a bac from 0 35 to 0 80 causes a coma unconsciousness life threatening respiratory depression and possibly fatal alcohol poisoning there are a number of factors that affect the time in which bac will reach or exceed 0 08 including weight the time since one s recent drinking and whether and what one ate within the time of drinking a 170lb male can drink more than a 135lb female before being over the bac level 15 one of the main effects of alcohol is severely impairing a person s ability to shift attention from one thing to another without significantly impairing sensory motor functions 14 this indicates that people who are intoxicated are not able to properly shift their attention without affecting the senses people that are intoxicated also have a much more narrow area of usable vision than people who are sober the information the brain receives from the eyes becomes disrupted if eyes must be turned to the side to detect stimuli or if eyes must be moved quickly from one point to another 14 effects on driving edit relative risk of a crash based on blood alcohol levels 16 research shows an exponential increase of the relative risk for a crash with a linear increase of bac 17 nhtsa reports that the following blood alcohol levels bac in a driver will have the following predictable effects on his or her ability to drive safely 18 bac effect 0 02 decline in visual functions rapid tracking of a moving target a decline in the ability to perform two tasks at the same time divided attention 0 05 reduced coordination reduced ability to track moving objects difficulty steering reduced response to emergency driving situations 0 08 concentration short term memory loss speed control reduced information processing capability e g signal detection visual search impaired perception 0 10 reduced ability to maintain lane position and brake appropriately 0 15 substantial impairment in vehicle control attention to driving task and in necessary visual and auditory information processing several testing mechanisms are used to gauge a person s ability to drive which indicate levels of intoxication one of these is referred to as a tracking task testing hand eye coordination in which the task is to keep an object on a prescribed path by controlling its position through turning a steering wheel impairment of performance is seen at bacs of as little as 0 7 mg ml 0 066 14 another form of tests is a choice reaction task which deals more primarily with cognitive function in this form of testing both hearing and vision are tested and drivers must give a response according to rules that necessitate mental processing before giving the answer 14 this is a useful gauge because in an actual driving situation drivers must divide their attention between a tracking task and surveillance of the environment 14 it has been found that even very low bacs are sufficient to produce significant impairment of performance in this area of thought process 14 grand rapids dip edit grand rapids borkenstein s relative risk of a crash based on blood alcohol levels versus more recent data 17 a 1964 paper by robert frank borkenstein studied data from grand rapids michigan 19 the main finding of the grand rapids study was that for higher values of bac the collision risk increases steeply for a bac of 0 15 the risk is 25 times higher than for zero blood alcohol the bac limits in germany and many other countries were set based on this grand rapids study subsequent research showed that all extra collisions caused by alcohol were due to at least 0 06 bac 96 of them due to bac above 0 08 and 79 due to bac above 0 12 20 one surprising aspect of the study was that in the main analysis a bac of 0 01 0 04 was associated with a lower risk of collisions than a bac of 0 a feature referred to as the grand rapids effect or grand rapids dip 20 21 a 1995 würzburg university study of german data similarly found that the risk of collisions appeared to be lower for drivers with a bac of 0 04 or less than for drivers with a bac of 0 20 studies of alcohol impairment on tests of driving ability have found that impairment starts as soon as alcohol is detectable thus the literature has for the most part treated the grand rapids dip as a statistical effect similar to simpson s paradox 22 the analysis in the grand rapids paper relied primarily on univariate statistics which could not isolate the effects of age gender and drinking practices from the effects of other variables 23 in particular when the data is re analyzed by constructing separate bac crash rate graphs for each drinking frequency there are no j shapes in any of the graphs and collision rates increase starting from 0 bac the analysis of the grand rapids study was biased by including drivers younger than 25 and older than 55 that did not drink often but had significantly higher crash rates even when not drinking alcohol 22 a newer study using data from 1997 1999 replicated the grand rapids dip but found that adjusting for covariates using logistic regression made the dip disappear 16 perceived recovery rate edit a direct effect of alcohol on a person s brain is an overestimation of how quickly their body is recovering from the effects of alcohol a study discussed in the article why drunk drivers may get behind the wheel was done with college students in which the students were tested with a hidden maze learning task as their bac blood alcohol content both rose and fell over an 8 hour period 2 the researchers found through the study that as the students became more drunk there was an increase in their mistakes and the recovery of the underlying cognitive impairments that lead to these errors is slower and more closely tied to the actual blood alcohol concentration than the more rapid reduction in participants subjective feeling of drunkenness 2 the participants believed that they were recovering from the adverse effects of alcohol much more quickly than they actually were this feeling of perceived recovery is a plausible explanation of why so many people feel that they are able to safely operate a motor vehicle when they are not yet fully recovered from the alcohol they have consumed indicating that the recovery rates do not coincide this thought process and brain function that is lost under the influence of alcohol is a very key element in regards to being able to drive safely including making judgments in terms of traveling through intersections or changing lanes when driving 2 these essential driving skills are lost while a person is under the influence of alcohol risks edit percentage of us car crash fatalities where driver blood alcohol level was 01 and above 1999 2012 drunk driving is one of the largest risk factors that contribute to traffic collisions as of 2015 for people in europe between the age of 15 and 29 driving under the influence of alcohol has been one of the main causes of mortality 24 according to the national highway traffic safety administration alcohol related crashes cause approximately 37 billion in damages annually 25 dui and alcohol related crashes have produced an estimated 45 billion in damages every year the combined costs of towing and storage fees attorney fees bail fees fines court fees ignition interlock devices traffic school fees and dmv fees mean that a first time dui charge could cost thousands to tens of thousands of dollars 26 traffic collisions are predominantly caused by driving under the influence for people in europe between the age of 15 and 29 it is one of the main causes of mortality 24 according to the national highway traffic safety administration alcohol related collisions cause approximately 37 billion in damages annually 25 every 51 minutes someone dies from an alcohol related collision when it comes to risk taking there is a large male predominance as personality traits anti social behaviour and risk taking are taken into consideration as they all are involved in dui s 27 over 7 7 million underage people ages 12 20 claim to drink alcohol and on average for every 100 000 underage americans 1 2 died in drunk driving traffic crashes 28 characteristics of drunk drivers edit personality traits edit although situations differ and each person is unique some common traits have been identified among drunk drivers in the study personality traits and mental health of severe drunk drivers in sweden 162 swedish dui offenders of all ages were studied to find links in psychological factors and characteristics there are a wide variety of characteristics common among dui offenders which are discussed including anxiety depression inhibition low assertiveness neuroticism and introversion 29 there is also a more specific personality type found typically more antisocial among repeat dui offenders it is not uncommon for them to actually be diagnosed with antisocial personality disorder aspd and exhibit some of the following personality traits low social responsiveness lack of self control hostility poor decision making lifestyle low emotional adjustment aggression sensation seeking and impulsivity 29 it is also common for offenders to use drinking as a coping mechanism not necessarily for social or enjoyment reasons when they are antisocial in nature and have a father with a history of alcoholism offenders who begin drinking at an earlier age for thrills and fun are more likely to be antisocial later in their lives the majority of the sample 72 came from what is considered more normal circumstances this group was older when they began drinking came from families without a history of alcoholism were relatively well behaved as children were not as physically and emotionally affected by alcohol when compared with the rest of the study and had the less emotional complications such as anxiety and depression the smaller portion of the sample 28 comes from what is generally considered less than desirable circumstances or not normal they tended to start drinking heavily earlier in life and exhibited more premorbid risk factors had a more severe substance abuse and psychosocial impairment 29 various characteristics associated with drunk drivers were found more often in one gender than another females were more likely to be affected by both mental a...