Amends the Illinois Public Labor Relations Act. Changes the definition of "supervisor". Provides that, in police units, if employees consist of sworn officers serving as shift commander or below, each shift commander, regardless of sworn rank, is a "supervisor" if he or she is responsible for several police officers, one or more units or teams, or an entire shift. Provides that, if there is no sworn rank between that of chief or sheriff and the highest ranked sworn shift commander, the employer may designate a single exempt shift commander position on each shift as a "supervisor". Specifies that each sworn or exempt rank above that of a designated exempt shift commander is a "supervisor".