Ind. Code § 25-31-1-16
(b) During the period of time that a registrant's certificate is valid, the registrant is authorized to apply the registrant's seal to plans, specifications, studies, drawings, and reports. Applying the registrant's seal attests that:
(c) It is unlawful for any person to stamp or seal any document with a seal after the certificate of the registrant named on the seal has expired or has been revoked.
Formerly: Acts 1935, c.148, s.16; Acts 1961, c.277, s.6. As amended by P.L.23-1991, SEC.24; P.L.215-1993, SEC.15.