One of the principal duties of a supervisor is the:

The training of subordinates is a principal duty of a supervisor because it plays a crucial role in ensuring that officers are equipped with the knowledge and skills necessary to perform their duties effectively. Through training, supervisors can help develop their team's competencies, improve performance, and ensure compliance with departmental policies and standards. Training also fosters professional growth and prepares officers for future responsibilities within the police force, enhancing overall department efficiency and effectiveness.

While management of budgets, enforcement of policies, and coordination of activities are important supervisory functions, they are often secondary to the foundational task of training. Without proper training, even well-coordinated activities or strict enforcement of policies may lead to inefficiencies or mistakes. Hence, prioritizing the development and training of personnel is essential for a well-functioning police department.