When is a signed written agreement from a doctor required for employees handling organophosphate pesticides?

A signed written agreement from a doctor is required for employees handling organophosphate pesticides specifically when these are labeled with "DANGER" or "WARNING." This requirement is in place because organophosphate pesticides can pose serious health risks, including harmful effects on the nervous system. The labels indicating "DANGER" or "WARNING" reflect the potential hazards associated with these chemicals, necessitating greater precautions, which includes ensuring that those who handle them are medically cleared to do so.

In this context, the use of a doctor’s written agreement acts as a safeguard for both the employees and the employer, confirming that the individual is fit to work with substances that could impact their health significantly.

The other options do not accurately reflect the requirements set by regulations regarding organophosphate pesticide handling. For example, the labels "CAUTION" indicate lower toxicity, thus not triggering the same level of medical oversight. Additionally, age-specific requirements, such as restricting handling based solely on employees being under 21, lack relevance to health and safety considerations surrounding organophosphate use. Regular handling of any pesticide does not automatically entail the requirement for medical authorization unless it meets the specified danger criteria associated with organophosphates.