10 ILCS 5/5-3
The Board of County Commissioners shall appoint the place of registry in each precinct for any precinct registration under Section 5-17 of this Article 5. Such place or places shall be in the most public, orderly and convenient portions thereof; and no building or part of a building shall be designated or used as a place of registry, in which spirituous or intoxicating liquor is sold. The County Clerk may demand of the Chief of Police of each city, village or incorporated town, or the Sheriff to furnish officers of the law to attend during the progress of any registration at any place or places of registration designated by the County Commissioners.
Such officers of the law shall be furnished by the Chief of Police or Sheriff and shall be stationed in the place or places of registration in such manner as the County Clerk shall direct, and during such assignment shall be under the direction and control of the County Clerk.
10 ILCS 5/5-3