Del. Code tit. 29, § 5312

The Board may require any employee, former employee or eligible survivor to furnish such information as may be required for the determination of benefits under this chapter, or to authorize the Board to procure such information including, but not limited to, information regarding benefits pursuant to the federal Social Security Act [42 U.S.C. § 301 et seq.]. The Board may withhold payment of any pension under this chapter whenever the determination of such pension is dependent upon such information and the employee, former employee or eligible survivor does not cooperate in the furnishing or procuring thereof.