Which statement is true regarding the use of a scaffold plank as a sill?

The assertion that a scaffold plank must never be used as a part of a platform again is important for safety reasons. Scaffold planks are designed to be durable and provide a stable surface, but once they have been used as a sill, they may have absorbed wear, damage, or deformity that can compromise their integrity. When a plank has served as a base for scaffolding—exposed to loads, environmental factors, and potential impacts—it may not be fit for use again as a platform where safety is paramount. This understanding emphasizes the importance of regularly inspecting and assessing the condition of scaffolding materials to ensure they meet the necessary safety standards before repurposing them in any way.