Nevada constitution
Article 4: legislative department
Section 20

Releasing the indebtedness, liability, or obligation of any corporation, association, or person to the state, or to any county, town, or city of this state; but nothing in this section shall be construed to deny or restrict the power of the legislature to establish and regulate the compensation and fees of county officers, to authorize and empower the boards of county commissioners of the various counties of the state to establish and regulate the compensation and fees of township officers in their respective counties, to establish and regulate the rates of freight, passage, toll, and charges of railroads, tollroads, ditch, flume, and tunnel companies incorporated under the laws of this state or doing business therein.