Which factor is essential for monitoring handlers of highly toxic pesticides?

Monitoring handlers of highly toxic pesticides is crucial for ensuring their safety and minimizing exposure risks. Visual or voice monitoring is essential because it allows for real-time observation of handlers as they apply these substances. This form of monitoring can provide immediate feedback on safety practices and potential hazards, ensuring that handlers are using proper protective equipment and following safety protocols correctly.

Visual monitoring enables supervisors to see how handlers respond to their environment, ensuring that they are adhering to safety measures. Voice communication can provide immediate instructions or warnings when necessary, which is vital in environments where toxic pesticides are being used and can help prevent accidents or exposures.

While factors like effective communication, technology-assisted monitoring, and written reports are important in their own rights, they do not offer the same immediate oversight and intervention capabilities that visual or voice monitoring provides. This type of monitoring ensures a direct connection between the person applying pesticides and their supervisors, which is essential when handling highly toxic materials.