JUST THE FACTS: TOTAL DRUG AND INDEX ARRESTS
Click on map/chart to enlarge
Facts At a Glance:
- In the last decade, the national total Index and
drug arrest rate decreased, while the Illinois total arrest rate increased. Throughout this time period, Illinois' total Index and drug
arrest rate was higher than
the national rate.
- The total Index and drug arrest rate in Illinois, from 1990
to 2002, increased 5 percent, from 1,639 to 1,722 arrests per 100,000persons in the population.
- Along with the statewide total arrest rate increase from
1990 to 2002, when individual counties were examined, 80 of Illinois' 102 counties experienced a notable increase
in their total Index and drug
arrest rate, while 17 counties experienced no significant change and only
five counties had notable decreases in their total arrest rates.
- From 1995 to 2002, 49 counties experienced no significant
change in their total Index and drug arrest rates, while 27 experienced notable increases, and 26 experienced notable decreases.
- When comparing the trend experienced from 1990 to 2002 to
the trend experienced from 1995 to 2002, it was found that of the 80 Illinois counties that experienced notable increases
in their total Index and drug arrest rates from 1990 to 2002, only 26 had increases from 1995 to 2002.
Sources: Federal Bureau of Investigation, Illinois State Police, and U.S. Census Bureau
The map legend is used to explain changes in county-level trends. The shaded areas represent whether notable changes have occurred at the county level in Illinois during the specified time period analyzed: gray- no significant change; blue- notable decrease; and red- notable increase.
It should be noted that an indication of no change does not necessarily mean there was no actual change in a county, but that the change experienced was not larger than what is expected given the natural fluctuation of numbers. The statistical procedure employed allows readers to make objective decisions uniformly across Illinois' 102 counties. Additionally, because the statistical procedure is a conservative measure of change, we can conclude with more confidence that the changes presented in this map are numerically, but not necessarily statistically significant.