Iowa constitution
Article I
Section 21

No bill of attainder, ex post facto law, or law impairing the obligation of contracts, shall ever be passed.

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Structure Iowa constitution

Iowa constitution

Article I

Section 1

Section 1a

Section 2

Section 3

Section 4

Section 6

Section 7

Section 8

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