Police

The Police are local defensive forces for everyday combat with common criminals.

Police
While the Marines maintain a high order of policing in the world, worldwide police officers are employed by the World Government to supervise local areas and arrest unlawful citizens.

Unlike the Marines that sails on seas, the policemen can't sail so they must stay on dry ground.

Duties
The duty of a police officer is to maintain law and order, however they only deal with local interests unlike the Marines who maintain a global presence across the world. They leave the task of capturing tough criminals to the Marines, but aid them where needed. So far they have only deployed in small numbers which sharply contrasts the scale of deployment of the Marines.

Ranks
The police forces across the world seem to be independent of any ranks, mostly due to the fact Oda has yet to release any ranking system for them. However high ranking officers seem to wear a long coat, much like the HQ rank and above Marines.

Police in the Series

 * In Commi Island, there is a Policeman name Genzo who wore a black suit with golden edges and a black police cap. So far he and Lafitte are the only named policeman in the series.
 * In Loguetown there is a man who was yelling at Luffy to get off the execution platform. He wore the same suit as Genzo, there are also other policemen that wore the same suit.
 * There is a Bounty Hunter in Whiskey Peak that dresses up as a policeman.
 * Even in Water 7, there are two people who wear the same suits while trying to stop Franky's rampage through the city which proves that there are common worldwide police who supervise local areas.
 * Lafitte of the Blackbeard Pirates was said to have been a former policeman, however evidently his "Ultra Violent" ways caused him to be exiled from West Blue.