Del. Code tit. 18, § 3515

A group health insurance policy shall contain a provision that a copy of the application, if any, of the policyholder shall be attached to the policy when issued, that all statements made by the policyholder or by the person insured shall be deemed representations and not warranties, and that no statement made by any person insured shall be used in any contest unless a copy of the instrument containing the statement is or has been furnished to such person or, in the event of the death or incapacity of the insured person, to the individual’s beneficiary or personal representative.