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Outline type of law enforcement operating in Chicagoland

Federal
ATF

DHS

FBI

TSA

US Marshal


State
Illinois State Police

Secretary of State

County Sheriff
Cook County Sheriff
Cook County Forest Preserve
DuPage County Sheriff
Lake County Sheriff
McHenry County Sheriff


Cities and Villages

Park District Police

Metropolitan Enforcement Groups

Task Forces

Detail

Mutual Aid
ILEAS
NIPAS

MCAT -- Major Case Assistance Team

Metra Police

Metropolitan Water Reclamation District