Ohio constitution
Article II: legislative
Section 28

The General Assembly shall have no power to
pass retroactive laws, or laws impairing the obligation
of contracts; but may, by general laws, authorize
courts to carry into effect, upon such terms as shall
be just and equitable, the manifest intention of parties,
and officers, by curing omissions, defects, and errors,
in instruments and proceedings, arising out of their
want of conformity with the laws of this state.