Any contract, rule, regulation or stratagem whatsoever the purpose or intent of which shall be to enable any common carrier to exempt itself from any liability created by NRS 705.260 to 705.340, inclusive, shall to that extent be void; but in any action brought against any such common carrier under or by virtue of any of the provisions of NRS 705.260 to 705.340, inclusive, such carrier may set off therein any sum it has contributed or paid to any insurance, relief benefit or indemnity that may have been paid to the injured employee, or the person entitled thereto on account of the injury or death for which such action was brought.
NRS 705.320