Illinois Traffic Stop Statistical Study Act:
RATE OF CONSENT SEARCHES PER TRAFFIC STOP, BY RACE,
ILLINOIS STATE POLICE IN 2004 THROUGH 2010
White drivers Black drivers Hispanic drivers Rates Compared
Year Stops Consent searches Stops Consent searches Stops Consent searches Black/ Hispanic/
# # % # # % # # % White White
(A) (B) (C) (D=C/B) (E) (F) (G=F/E) (H) (I) (J=I/H) (K=G/D) (L=J/D)
2004 290,224 1,119 0.39% 59,602 418 0.70% 27,056 297 1.10% 1.82 2.85
2005 328,420 1,923 0.59% 69,543 720 1.04% 32,450 729 2.25% 1.77 3.84
2006 337,529 1,819 0.54% 78,721 752 0.96% 32,868 700 2.13% 1.77 3.95
2007 364,377 520 0.14% 82,954 375 0.45% 35,933 179 0.50% 3.17 3.49
2008 342,352 480 0.14% 69,078 277 0.40% 33,750 128 0.38% 2.86 2.71
2009 340,485 460 0.14% 74,054 289 0.39% 33,295 143 0.43% 2.89 3.18
2010 332,951 412 0.12% 68,367 250 0.37% 32,242 135 0.42% 2.96 3.38
Data source: Information in columns B, C, E, F, H, and I is from the NU/UIC data sheets. Specifically, B, E, and H is
reported as "stops", and C, F, and I is reported as "searches - consent" or "consent searches - performed".
Note: As to the information above in column E for 2008, the data sheet contains a typo (a number of stops that is
impossibly large), and the ACLU has substituted a corrected number (by subtracting the number of stops of
other groups from the total number of stops).
Data analysis: Information in columns D, G, J, K, and L is calculated as shown by the ACLU.
Illinois Traffic Stop Statistical Study Act:
TRAFFIC STOP CONSENT SEARCHES THROUGHOUT ILLINOIS, IN 2004 THROUGH 2006
Year Consent search rates Rates compared
White drivers Black drivers Hispanic drivers Black/White Hispanic/White
(A) (B) (C) (D) (E=C/B) (F=D/B)
2004 0.9% 2.7% 2.1% 3.1 2.4
2005 0.7% 2.5% 2.0% 3.4 2.7
2006 0.7% 2.5% 1.8% 3.6 2.6
Data source: Annual ITSSSA reports of the Northwestern Center for Public Safety.
Illinois Traffic Stops Statistical Study Act:
STATEWIDE CONSENT SEARCH RATES OF DIFFERENT RACES
Year Black/White rate Hispanic/white rate
2004 3.1 2.4
2005 3.4 2.7
2006 3.6 2.6
Data source: Annual ITSSSA reports of the Northwestern Center for Public Safety.