2023 Washington Code 18.145.010 – Certificate required

2022 Washington Code 18.145.010 – Certificate required

2020 Washington Code 18.145.010 – Certificate required

2019 Washington Code 18.145.010 – Certificate required

2018 Washington Code 18.145.010 – Certificate required

2016 Washington Code 18.145.010 – Certificate required

2015 Washington Code 18.145.010 – Certificate required

2014 Washington Code 18.145.010 – Certificate required

2013 Washington Code 18.145.010 – Certificate required

2009 Washington Code 18.145.010 – Certificate required