Section 23-807 - Agreement exempting employer from liability void; setoffs by employerA. Any contract, rule, regulation or device whatever, the purpose or intent of which is to enable an employer to exempt himself from any liability created by this article, is to that extent void.B. In an action brought under this article the employer may set off any amount he has contributed or paid for any insurance, relief, benefit or indemnity, or has paid to the injured employee or his personal representative on account of the injury or death for which the action is brought.