16 Del. Admin. Code § 4204-3.0
Except as hereinafter provided, all human bodies dead within the State of Delaware shall be cremated or buried, or placed within a receiving vault within five (5) days after death. Any dead human body to be kept longer then twenty-four (24) hours shall be embalmed or placed in a hermetically sealed casket which will not be opened at any time after this twenty-four (24) period, except when medical or legal investigation necessitates a longer period. The Department shall issue a special permit in such cases. Application for such a permit shall be made to the State Registrar of Vital Statistics, Dover. Bodies to be kept more than twenty-four (24) hours under this exception must be stored in suitable, approved refrigeration facilities.
16 Del. Admin. Code § 4204-3.0