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JUST THE FACTS: TOTAL DRUG AND INDEX ARRESTS

JUST THE FACTS: TOTAL DRUG AND INDEX ARRESTS -- CLICK FOR FULL SIZE IMAGE JUST THE FACTS: TOTAL DRUG AND INDEX ARRESTS -- CLICK FOR FULL SIZE IMAGE

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Facts At a Glance:


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.