Synopsis As Introduced Amends the Illinois Governmental Ethics Act. Modifies the definition of "representation case" to include matters before units of local government. Provides that no legislator or employee of a governmental entity may accept or participate in any way in any representation case if the State or unit of local government is an adverse party or if the result is an adverse effect on State or local revenue, State or local finances, or the health, safety, welfare, or relative tax burden of any State resident. Prohibits (rather than allows) participation in a representation case by a person with whom the legislator maintains a close economic association. Provides that no legislator or employee of a governmental entity may derive any income, compensation, or other tangible benefit from providing opinion evidence as an expert against the interests of the State or a unit of local government in any judicial or quasi-judicial proceeding before any administrative agency or court. Provides that a legislator shall officially recuse himself or herself, including a written explanation of the recusal, from any legislative matter in which the legislator or his or her spouse or immediate family member has a financial interest. Makes conforming and other changes.