In an article on what states can I become a cop in with a high school diploma, I came across the mention of specialty departments of police academy. What are they?

One can become a cop with a minimum of high school diploma. However, majority of the people opt for some specialization in relevant fields, such as criminal justice and law enforcement. Police academy has three specialty departments, narcotics department, property crimes department and organized crime department. A person planning to become a police officer can choose between these three.