2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsTable 107. BAC Among Drug-Positive Drivers by Drug Category (Percentage by Column) (Blood)BAC (g/dL)Drug CategoryZeroBetween Zeroand .08 .08+N=386 N=62 N=18Illegal 60.5% 84.2% 92.5%Medications 34.9% 9.0% 7.5%Illegal & Medications 4.6% 6.8% 0.0%“Medications” includes prescription and over-the-counter drugs.In this table, percentages are weighted.High alcohol-positive drivers (i.e., drivers with a .08 BAC g/dL or greater) who tested positivefor “Illegal” drugs were more likely to be age 44 or younger (p < .01). The sample size was verysmall for drivers aged 45 or older, in particular those aged 65 or older. (Note that, due to thenumber of groupings in Table 108 and the small sample sizes, caution should be exercised ininterpretation of these findings.)Table 108. BAC of Drivers by Drug Category and Age (Blood)BAC (g/dL)Age Drug CategoryN(Unweighted) ZeroBetweenZero and .08 .08+Illegal 56 69.8% 24.3% 5.9%Medications 8 100.0% 0.0% 0.0%16-20Illegal & Medications 4 95.6% 4.4% 0.0%Negative 391 97.8% 1.9% 0.3%Overall 459 92.9% 5.9% 1.3%Illegal 141 69.3% 20.9% 9.7%Medications 48 96.3% 1.0% 2.7%21-34 Illegal & Medications 13 49.0% 51.0% 0.0%Negative 1,170 91.7% 7.0% 1.3%Overall 1,372 88.9% 8.7% 2.3%Illegal 43 78.1% 12.6% 9.3%Medications 43 90.6% 6.6% 2.8%35-44 Illegal & Medications 7 100.0% 0.0% 0.0%Negative 532 95.6% 3.4% 1.0%Overall 625 94.4% 4.1% 1.5%Illegal 26 91.8% 8.2% 0.0%Medications 61 96.6% 3.4% 0.0%45-64 Illegal & Medications 6 100.0% 0.0% 0.0%Negative 604 92.5% 6.0% 1.5%Overall 697 92.8% 5.8% 1.3%Illegal 0 NA NA NAMedications 9 59.9% 40.1% 0.0%65+ Illegal & Medications 0 NA NA NANegative 82 95.3% 4.7% 0.0%Overall 91 93.2% 6.8% 0.0%“Medications” includes prescription and over-the-counter drugs.NA = “Not Applicable.”In this table, percentages are weighted.88
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsMale drivers who tested positive for “Illegal” drugs (Table 109) had statistically greaterpercentages of alcohol-positive results than their female counterparts (p < .05).GenderMalesFemalesTable 109. BAC of Drivers by Drug Category and Gender (Blood)BAC (g/dL)Drug CategoryNBetween Zero(Unweighted) Zero and .08 .08+Illegal 191 72.1% 17.4% 10.6%Medications 75 90.5% 8.4% 1.1%Illegal & Medications 19 70.8% 29.2% 0.0%Negative 1,707 92.9% 5.8% 1.3%Overall 1,992 90.5% 7.3% 2.2%Illegal 76 70.7% 27.8% 1.5%Medications 94 96.8% 1.4% 1.8%Illegal & Medications 11 96.1% 3.9% 0.0%Negative 1,097 95.0% 4.2% 0.8%Overall 1,278 93.3% 5.7% 0.9%“Medications” includes prescription and over-the-counter drugs.In this table, percentages are weighted.Oral Fluid and/or Blood Results (Nighttime Samples)Driver Drug Use Prevalence Based on Oral Fluid and/or Blood ResultsThis section of the report presents the joint results of oral fluid and blood analyses for all of thedrugs indicated in the introductory section (see Tables 17 and 18) for nighttime drivers. As notedearlier, blood was only obtained from nighttime drivers. The tables in this section are based onthe 5,910 nighttime drivers from whom an oral fluid and/or a blood sample was obtained andanalyzed. If a driver tested positive for one or more of the drugs in either the oral fluid and/or inthe blood analyses, he/she was categorized as drug-positive. Thus, this section provides the mostcomprehensive nighttime drug prevalence estimates available using the biological specimensobtained in this study. Again, these are overall drug prevalence estimates, including illegal,prescription, and over-the-counter drugs or their metabolites and do not necessarily implyimpairment. Within individual tables, overall counts may not total 5,910 because of missingvalues on some variables.When we examine the test results from nighttime drivers providing oral fluid and/or blood, 16.3percent of drivers were drug-positive, as indicated in Table 110.89
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Page 148: DOT HS 811 249December 2009
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2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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