Indiana Code Title 5. State and Local Administration § 5-10.4-7-1

(1) notify each person to be employed in a teaching position that the person's obligations under this article are a condition of employment;  and

(2) make the obligations a part of the teacher's contract.

(1) the contribution is made on behalf of the member;  or

(2) a retired member of the Indiana state teachers' retirement fund may not make contributions during a period of reemployment as provided under IC 5-10.2-4-8(e);