2023 Washington Code 18.145.080 – Certification requirements

2022 Washington Code 18.145.080 – Certification requirements

2020 Washington Code 18.145.080 – Certification requirements

2019 Washington Code 18.145.080 – Certification requirements

2018 Washington Code 18.145.080 – Certification requirements

2016 Washington Code 18.145.080 – Certification requirements

2015 Washington Code 18.145.080 – Certification requirements

2014 Washington Code 18.145.080 – Certification requirements

2013 Washington Code 18.145.080 – Certification requirements

2009 Washington Code 18.145.080 – Certification requirements