Idaho Code § 59-1306
Chapter 13, title 59, and chapter 14, title 72, Idaho Code, shall be administered in a manner so as to comply with the requirements of 26 U.S.C. section 401(a)(8), (9), (16), (25), (31), (36) and (37) and with the vesting requirements described in 26 U.S.C. section 411(e)(2). The public employee retirement system board shall promulgate rules and amend or repeal conflicting rules in order to assure compliance with the requirements of these sections. This chapter shall be in full force and effect only so long as compliance with paragraphs (8), (9), (16), (25), (31), (36) and (37) of subsection 401(a) and paragraph (2) of subsection 411(e) of the Internal Revenue Code is required for public retirement systems. If compliance with any such paragraph is, at any point no longer required, this provision or the applicable portion thereof, will cease to have any force or effect.
Idaho Code § 59-1306