Romans, who had one of the most advanced justice systems on earth didn't have any jails. And from what I'm considering, I think they are just a waste of time and money, causing more problems after someone exits the prison.
What did the Romans do instead:
-Fines
-Physical Punishment
-Exile
-Death Sentence
What did the Romans do instead:
-Fines
-Physical Punishment
-Exile
-Death Sentence