Priority Indicator #22: Rate of DUII Arrests


Total Rate of DUII Arrests

Contents: Background Information | Data Tables | Data Charts | Commentary | Download Data
New: DUI Arrests Data Map (Internet Explorer Users: zoom to full extent for best map quality)

Background Information

What Does This Indicator Mean?
This indicator measures the rate of arrests for driving under the influence of intoxicants by geographic region. DUII arrests are often indicative of other social problems such as high rates of alcohol and drug abuse, spousal and child abuse and declining economic indicators.

Referring to a specific time period and geographic region, this indicator measures the total number of arrests for DUII in the region divided by the population of the area and multiplied by 1,000.   DUII arrests are reported by the police department or sheriff’s office making the arrest, and not by the residence address of the arrestee, so these rates will vary greatly as a result of political decisions within a region.  Further, the jurisdictions of law enforcement agencies overlap in many cases, skewing the city-level rates for this measure.

Other Risk Factors or Indicators to Consider
DUII arrests are directly tied to the levels of drug and alcohol abuse, spousal and child abuse, unemployment and poverty within a community.  While the direct relationships between them is not always clear, when analyzing the rate of DUII arrests, these factors should be considered as well.

Political decisions also play a major role in determining this indicator.  Factors such as the ratio of police to population, the existence of programs targeted at reducing DUII’s or overall alcohol and drug use will all affect the rate of arrests for DUII.  For example, it should be noted that Monmouth is a “dry” community--that is, it is illegal to sell alcohol within the city limits.  This will obviously affect the rate of alcohol consumption and likely the rate of DUII arrests in the community and surrounding areas.  

Limitations of the Data
These data are reported by the individual law enforcement agencies within a region.  There is no means of verification that a particular agency has reported all arrests for a given time period, though these data are considered highly accurate and reliable.

These data most certainly under report the number of DUII arrests due to reporting procedures.  If an individual is arrested on more than one charge (e.g., DUII and vehicular manslaughter) only the most serious crime (manslaughter) is captured in the data collection system.  This is a national norm that began in the 1930’s and is considered standard practice as part of the Uniform Crime Reporting process nationwide.

Data Sources

  • Arrest figures are from the Oregon Law Enforcement Data System (LEDS) Oregon Uniform Crime Reporting Program

  • Population data are from Portland State University Center for Population Research and Census and the US Census Bureau

Presentation and Discussion of the Data

The table below shows the rate of arrests for DUII per 1,000 people.  It gives the total rate for Marion and Polk Counties and the rate for places within those counties.

Region 1997 1998 1999 2000
Marion County 5.92 6.97 6.63 6.32
Polk County 4.56 6.24 6.89 6.49

Marion County Places

Aumsville 6.30 7.44 5.14 7.33
Aurora 30.39 14.43 10.04 44.27
Gervais 18.17 16.79 19.62 12.44
Hubbard 52.78 23.72 39.62 10.87
Keizer 3.79 4.18 5.26 5.43
Rural Marion County 0.09 0.18 0.16 0.10
Salem (all) 4.77 5.23 4.59 3.29
Silverton 7.26 6.28 6.10 7.15
Stayton 5.75 5.99 7.71 4.40
Turner 5.08 0.73 1.46 0.83
Woodburn 13.29 8.23 5.98 7.41

Polk County Places

Dallas 5.64 10.04 10.11 6.26
Falls City 2.22 2.22 10.35
Independence 8.90 11.49 13.57 14.08
Monmouth 4.27 4.77 3.66 4.26
Rural Polk County 4.68 3.96 5.59 7.10

The chart below shows the total rate of DUII arrests per 1,000 people in Marion and Polk Counties.

The chart below shows the total rate of DUII arrests per 1,000 people in 1997 and 2000 for places within Marion and Polk Counties.

Commentary

In 1997 and 1998, the total rate of DUII arrests was higher in Marion County than in Polk County.  The total rate of DUII arrests increased in both counties in 1998.  Polk County's rate continued to increase in 1999, and then fell in 2000.  Marion County's rate decreased in 1999 and 2000, so that the Marion County rate was lower than Polk County's.  

Download the Data

Download Data in Microsoft Excel 

Download Data as a Tab Delimited Text File (Windows users: right click on this link, save file, and then open in your favorite spreadsheet; Mac users: click the link and hold for a second or two, then save the file and open it in a spreadsheet)

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Rate of Juvenile DUII Arrests

Contents: Data Tables | Data Charts | Commentary | Download Data
New: Juvenile DUI Arrests Data Map (Internet Explorer Users: zoom to full extent for best map quality)

Presentation and Discussion of the Data

The table below shows the number of juveniles arrested for driving under the influence of intoxicants.  We present the number of arrests rather than the arrest rates because rates are very low.

  1997 1998 1999 2000
Marion County 28 29 19 19
Polk County 3 8 10 5
Places in Marion County
Aumsville 0 1 0 1
Aurora 1 0 0 0
Gervais 0 2 0 1
Hubbard 3 0 2 1
Keizer 5 3 1 0
Rural Marion County 2 0 1 0
Mt. Angel 2 0 0 1
Salem (all) 6 11 10 5
Silverton 2 1 0 1
Stayton 0 0 0 0
Turner 0 1 0 0
Woodburn 4 1 1 4
Places in Polk County
Dallas 2 2 6 2
Falls City   0 0 0
Independence 0 1 2 0
Monmouth 1 2 1 0
Rural Polk County 0 3 0 1
Salem (Polk) 0 0 0 1
Source: Oregon Law Enforcement Data System, compiled by Marion-Polk CHIP.  http://www.willamette.edu/publicpolicy/chip

The chart below shows the rate of juvenile arrests for DUII in Marion and Polk Counties.

Commentary

In both Marion and Polk County the total number of juvenile arrests for DUII in recent years has been exceptionally low.  The juvenile arrest rate for DUII in Marion County fell in 1999.  The juvenile DUII arrest rate in Polk County is fairly volatile because there are very few arrests each year.  Thus a change of a few arrests will greatly impact the rate. 

Download the Data

Download Data in Microsoft Excel 

Download Data as a Tab Delimited Text File (Windows users: right click on this link, save file, and then open in your favorite spreadsheet; Mac users: click the link and hold for a second or two, then save the file and open it in a spreadsheet)

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This page last updated 4 October 2001