Louisiana does not use Roman Law. We have a hybrid system of the Common Law and the Civil Law.
The Civil Law has its origins in Rome, but the LA Civil Code has its basis in the Code of Napoleon.
Our criminal law, which is in a separate code, namely the Criminal Code, has incorporated portions from the Model Penal Code. Our definition of theft is in the Criminal Code, not the Civil Code.
So, in short, you're wrong.
-aimee, 2nd year LSU law student