Which location is not appropriate for hand washing after working with human material in the laboratory?

The hand washing sink in the break room is not appropriate for washing hands after working with human material in the laboratory due to the potential for cross-contamination and the need for maintaining a sterile environment. Break rooms are generally designated for eating and relaxation, and introducing the risk of biological contaminants into these areas can pose health risks to individuals who may use the break area later.

In contrast, designated hand washing sinks in the lab are specifically designed for this purpose, ensuring that they are equipped with appropriate supplies and are in a location where the risk of contamination from other activities is minimized. Hand washing stations in hallways should also be avoided for the same reasons unless they are designed for the specific use of decontaminating after laboratory work. Sinks in supply rooms, while not ideal, are generally not intended for eating or relaxing and may be considered for hand washing as a last resort, depending on their setup and proximity to the lab.