I knew an inmate in Pennsylvania, the prison system there stopped accepting physical mail if you wanted to write an inmate, you sent a letter to a company in Florida. While their name was also in the address, the letter was to "Smart communications," in a state where you knew they were not located. That's probably the excuse they'd use -- the actual mail is not being sent to the addressee.
(In Florida, the letter was opened and scanned, then transmitted to the prison, where it was printed and delivered. It was always unclear whether it was read and reviewed in Florida or Pennsylvania or both.)
Are you confusing the term 'prisoner' with 'criminal'? Prisoner is used to refer to people waiting for trial frequently, and dictionaries seem to support this definition.
Perhaps you have a different term besides "prisoner" to describe someone who is imprisoned before their trial rather than after. But the parent comment is correct: whatever you call them, these people are not afforded all of the rights that the rest of us have.
This is the truth. The legal exception is literally carved out in the 13th amendment; the government reserved the right to make slaves of its prisoners.
They lace their mail with spice as a way to smuggle it into prison. You have to live under certain restrictions when you are a prisoner because of the consequences of your actions.
(In Florida, the letter was opened and scanned, then transmitted to the prison, where it was printed and delivered. It was always unclear whether it was read and reviewed in Florida or Pennsylvania or both.)