Illinois constitution
Article I
Section 16

No ex post facto law, or law impairing the obligation of
contracts or making an irrevocable grant of special
privileges or immunities, shall be passed.

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Structure Illinois constitution

Illinois constitution

Article I

Section 1

Section 2

Section 3

Section 4

Section 5

Section 6

Section 7

Section 8

Section 8.1

Section 9

Section 10

Section 11

Section 12

Section 13

Section 14

Section 15

Section 16

Section 17

Section 18

Section 19

Section 20

Section 21

Section 22

Section 23

Section 24

Section 25