The Baltimore Police Department plays an integral part in The Wire, with characters in this field range from those enforcing the law at street level up to the administrators who regulate the department.
The department is led by a Police Commissioner assisted by Deputy Commissioners of Operations (often shortened to Deputy Ops) and Administration. The Police Commissioner answers directly to the city mayor and outlines the departmental goals enforced by the Deputy Commissioners. The Deputy Ops wields a great deal of power and is responsible for the day-to-day activity of the department's district and investigative unit commanders. The Administrative Deputy oversees the Internal Investigations Division (IID) and other units. The real life chain of command from the Commissioner downwards is Deputy Commissioner, Chief, Colonel, Lieutenant Colonel, Major, Captain, Lieutenant, Sergeant, and Detective/Officer. However, in the series, any mention of the ranks of Chief, Lieutenant Colonel, and Captain is omitted. Presumably this is to avoid confusion and make the relationships between different members of the hierarchy clearer to the viewer. Detectives fall into a rank that coincides with their administrative position. The Criminal Investigations Division, commanded usually by a Colonel, is the division responsible for the Homicide unit, Narcotics unit, and Major Crimes Unit (MCU) among others. The IID, homicide unit, and narcotics unit are each led by a Major while MCU is commanded by a lieutenant. A Major commands each of the nine patrol districts - the Central, Northern, Northeastern, Eastern, Southeastern, Southern, Southwestern, Western and Northwestern districts.
Rawls is Acting Commissioner on a temporary basis. Rawls is caucasian, and Mayor Tommy Carcetti is unwilling to attempt a permanent promotion fearing that it would not be acceptable to the politically influential and largely black ministers. Rawls is a careerist and is feared by many of his subordinates. He has been known to punish anyone who crosses him with transfers to undesirable posts. It is hinted at throughout the series that Rawls is a closeted homosexual. This is most clearly evident in Season Three when he is seen patronizing a gay bar. Also in season four graffiti is seen on a wall in the bathroom at the police station stating that "Rawls Sucks Cock." Rawls is played by John Doman.
Daniels is the Deputy Commissioner of Operations. He is a direct commanding officer of many of the show's characters in earlier seasons. Daniels previously worked as a lieutenant in the Eastern District Drug Enforcement Unit, CID Narcotics Unit, and was the first commander of the MCU. Daniels is promoted to Major and Western District Commander after his successful case work in the MCU. He draws Carcetti's attention as a young and capable black commander and is quickly promoted to CID Colonel. He is eventually promoted to Police Commissioner, but resigns to practice law. Daniels is played by Lance Reddick