2023 Washington Code 18.290.100 – Prohibited practices

2022 Washington Code 18.290.100 – Prohibited practices

2020 Washington Code 18.290.100 – Prohibited practices

2019 Washington Code 18.290.100 – Prohibited practices

2018 Washington Code 18.290.100 – Prohibited practices

2016 Washington Code 18.290.100 – Prohibited practices

2015 Washington Code 18.290.100 – Prohibited practices

2014 Washington Code 18.290.100 – Prohibited practices

2013 Washington Code 18.290.100 – Prohibited practices