Which of the following is a key concept that should guide law enforcement decision-making?

The key concept that should guide law enforcement decision-making is department policy. This is because departmental policies are established to standardize procedures, ensure consistent law enforcement practices, and comply with legal and ethical standards within the community they serve. These policies are often developed based on legal requirements, best practices, and community needs, providing a framework for officers to make decisions that align with the organization's goals and objectives.

By adhering to department policy, law enforcement officers ensure that their actions are accountable, transparent, and in accordance with the law, which is essential for maintaining public trust and confidence in the police. While factors like cost-effectiveness, public opinion, and personal sentiments can influence decision-making, they do not provide the structured guidance and uniformity that department policies offer, which are crucial for effective law enforcement operations.