Versions of See prior versions of a law on LawServer 2023 Washington Code 18.83.220 – Supervised experience hours — Reduction for certified chemical dependency professionals 2022 Washington Code 18.83.220 – Supervised experience hours–Reduction for certified chemical dependency professionals 2020 Washington Code 18.83.220 – Supervised experience hours — Reduction for certified chemical dependency professionals 2019 Washington Code 18.83.220 – Supervised experience hours — Reduction for certified chemical dependency professionals