Indiana Code Title 5. State and Local Administration § 5-10.3-7-3

Sec. 3. (a) Members of the general assembly, including members who:

are entitled to become, at their option, members of the fund.  A member of the general assembly who completed his service before July 1, 1987, in order to become a member of the fund must apply to the board for membership and must present evidence satisfactory to the board of his prior service.  Such a member of the general assembly may become a member without any service after June 30, 1987.

(b) Notwithstanding the exclusion specified in section 2(4) of this chapter, a member of the general assembly who is a member of the Indiana state teachers' retirement fund and who retires after June 30, 1980, may choose at his retirement date to become a member of the public employees' retirement fund and to receive his retirement benefit from the fund.

(c) An employee who:

and who is occupying a position normally requiring performance of services of less than one thousand (1,000) hours a year may at his option be a member of the fund.