2023 Washington Code 70.42.070 – Proficiency testing program

2022 Washington Code 70.42.070 – Proficiency testing program

2020 Washington Code 70.42.070 – Proficiency testing program

2019 Washington Code 70.42.070

2018 Washington Code 70.42.070 – Proficiency testing program

2016 Washington Code 70.42.070 – Proficiency testing program

2015 Washington Code 70.42.070 – Proficiency testing program

2014 Washington Code 70.42.070 – Proficiency testing program

2013 Washington Code 70.42.070 – Proficiency testing program

2009 Washington Code 70.42.070 – Proficiency testing program