Neb. Rev. Stat. § 69-2435

A permitholder shall continue to meet the requirements of section 69-2433 during the time he or she holds the permit, except as provided in subsection (2) of section 69-2443 . If, during such time, a permitholder does not continue to meet one or more of the requirements, the permitholder shall return his or her permit to the Nebraska State Patrol for revocation. If a permitholder does not return his or her permit, the permitholder is subject to having his or her permit revoked under section 69-2439 .