When ordering books from amazon.com to be sent to prisons, amazon does not offer a choice of shippers. You have no control over how your order is shipped. If the prison you are sending to accepts only USPS (like some Florida prisons) your order will be returned to amazon.com if the shipper happens to be UPS. I've talked to amazon.com about this. They said that they hope to offer a choice of shippers some time in the future.