Nev. Rev. Stat. § 244A.563
The faith of the State is hereby pledged that NRS 244A.455 to 244A.573, inclusive, any law supplemental or otherwise pertaining thereto, and any other act concerning the bonds or other county or state securities, taxes or the pledged revenues, or any combination of such securities, such taxes and such revenues, shall not be repealed nor amended or otherwise directly or indirectly modified in such a manner as to impair adversely any outstanding county or state securities, until all such securities have been discharged in full or provision for their payment and redemption has been fully made, including, without limitation, from the known minimum yield from the investment or reinvestment of moneys pledged therefor in federal securities.
NRS 244A.563