Versions of Louisiana Civil Code 764 - Burden of proof of use. on LawServer 2023 Louisiana Civil Code 764 – Burden of proof of use. 2022 Louisiana Civil Code 764 – Burden of proof of use. 2021 Louisiana Civil Code 764 – Burden of proof of use. 2020 Louisiana Civil Code 764 – Burden of proof of use. 2019 Louisiana Civil Code 764 – Burden of proof of use.