Accident Investigation Unit

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The McHenry County Sheriff's Office utilizes an on-call team to investigate and take enforcement action on serious injury and fatal traffic crashes.  Members of the accident investigation unit specialize in the documentation, preservation, and reconstruction of traffic crash evidence.  Members further specialize in enforcement of DUI laws and procedure.

On scene, members document evidence through photographs, extensive notes, and the use of a Topcon GPT-7505 total station.  The total station allows for documentation of evidence accurate to one tenth of an inch and produces a digital map of the scene allowing for the production of detailed crash maps.  Further information is gathered through the crashed vehicle's event data recorders allowing for a better picture of what led to the crash.

Six members of the unit are graduates of the Northwestern Center for Public Safety Traffic Crash Reconstruction program and have obtained their Crash Reconstruction Specialist certification through the Illinois Law Enforcement Training Standards Board.

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