Neb. Rev. Stat. § 84-1327

Any person who, knowing it to be false or fraudulent, presents or causes to be presented a false or fraudulent claim or benefit application, any false or fraudulent proof in support of such a claim or benefit, or false or fraudulent information which would affect a future claim or benefit application to be paid under the retirement system for the purpose of defrauding or attempting to defraud the retirement system shall be guilty of a Class II misdemeanor. The retirement board shall deny any benefits that it determines are based on false or fraudulent information and shall have a cause of action against the member to recover any benefits already paid on the basis of such information.