Providing that the default retirement plan for legislators is the defined contribution plan through PERS

Added the university system retirement program and chapter 21 systems to the list of plans where new legislators may return to active membership or remain inactive.

Removed the requirement for new legislators to join the public employees' retirement system defined contribution plan if they are already members of other specific retirement systems (chapters 5-9, 13, 20, or 21).

Changed the definition of eligible retirement systems from a general list to a specific list including 'defined benefit' systems, clarifying the distinction between different plan types.

Restructured the mandatory participation clause to require new legislators to join the public employees' retirement system defined contribution plan only if they are not already active, inactive, or retired members of other specified systems.