2023 Washington Code 18.380.020 – Licensure or certification required — Unauthorized practices

2022 Washington Code 18.380.020 – Licensure or certification required–Unauthorized practices

2020 Washington Code 18.380.020 – Licensure or certification required — Unauthorized practices

2019 Washington Code 18.380.020 – Licensure or certification required — Unauthorized practices

2018 Washington Code 18.380.020 – Licensure or certification required — Unauthorized practices

2016 Washington Code 18.380.020 – Licensure or certification required–Unauthorized practices