North Las Vegas Police Department 400 Codes Practice Test

On arrival at a high-risk event, the priority is scene safety and rapid resource deployment. The best initial action is to secure the scene and request backup. Securing the scene establishes a perimeter and controls access, reducing risk to officers, bystanders, and potential witnesses while creating a safe space to operate and preserve evidence. At the same time, promptly contacting dispatch to request backup ensures the right units—and any specialized teams or EMS—are en route and that command can be established. Waiting for a supervisor before acting delays protection and can allow the situation to worsen. Approaching without dispatcher communication bypasses critical coordination, increasing risk to everyone involved. Interviewing individuals before securing the scene can put you and others in danger and may contaminate any evidence.