18 Del. C. § 3356A
Recordkeeping requirements.
A pharmacy benefits manager shall maintain adequate books and records about each purchaser for which the pharmacy benefits manager provides pharmacy benefits management services as follows:
(1) In accordance with prudent standards of record keeping.
(2) For the duration of the agreement between the pharmacy benefits manager and the purchaser.
(3) For 3 years after the pharmacy benefits manager ceases to provide pharmacy benefits management services for the purchaser.