All sales are final. Because PatriotBio supplies laboratory research materials, we cannot verify handling, storage, or chain of custody once products leave our facility, so we do not accept returns, exchanges, or refunds on delivered products — including for change of mind, incorrect selection, ordering errors, refused deliveries, carrier delays, or products returned after delivery. Exceptions apply only if PatriotBio determines the wrong item was shipped, or an approved insured-shipment claim is verified as lost or damaged in transit.