Licensed plumbers may be required to ______________ to prove competence.

The requirement for licensed plumbers to retake the state exam to prove competence is rooted in the necessity for ongoing assessment of knowledge and skills in the plumbing profession. State exams are designed to ensure that plumbers are up-to-date with current codes, regulations, and best practices in the industry, which can change over time. Retaking the exam can be a way to reaffirm a plumber's understanding of crucial concepts and ensure that they meet the standards necessary for safe and effective plumbing work. This process not only helps to maintain high industry standards but also protects public health and safety by confirming that the plumber's knowledge is current and comprehensive.

Although completing additional courses, attending workshops, or submitting proof of work experience can also be valuable for professional development, they do not serve the same purpose as retaking the state exam in verifying formal competence as mandated by regulations.