All Board investigators engaging in underage compliance check operations under this Subpart shall comply with the directive in Section 79 of the Act to exercise their powers, to the fullest extent practicable, in cooperation with the local police department of the applicable municipality or, if these powers are exercised outside the boundaries of an incorporated municipality or within a municipality that does not have its own police department, in cooperation with the police department whose jurisdiction encompasses the applicable municipality.
Ill. Admin. Code tit. 11, § 1800.2170