Ind. Code § 4-23-7.2-11
(b) The board may appoint a historical marker advisory committee to serve without compensation. The committee may advise the board and the director concerning the following:
(d) No historical marker may be erected on a highway of the state highway system without the approval of the historical bureau as to its historical accuracy. This provision is in addition to any other requirement of law.
As added by Acts 1981, P.L.40, SEC.8. Amended by P.L.38-1989, SEC.1; P.L.31-1997, SEC.2; P.L.84-2012, SEC.14.