Police memorabilia collecting

Police memorabilia collecting is a hobby involving the collection and trading of law enforcement-related items such as patches, badges, uniforms, equipment, hats, helmets, training manuals, medals, and decommissioned or restored police cars. Memorabilia generally focuses on collecting historical artifacts such as turn-of-the-century screw-based handcuffs, though it can also include collecting modern items, typically those that have been decommissioned.
Public collection.
In the United States, many laws have been enacted which control possession of law enforcement insignia for security purposes, and this has impacted civilian collecting because they do not want the patches to be given to anyone other than law enforcement officers. In addition to this, patch reproductions have also become a problem amongst collectors, and most serious historians regard the reproductions as having no value. Various organizations, such as the California Law Enforcement Historical Society, sponsor annual events which spotlight the historical significance of preserving accurate information for future generations. West Virginia Law prohibits trading patches, though North Carolina law prohibits departments selling patches.
Though many do not trade or give away patches, some police departments sell their patches for new equipment, charity, or for a police explorer program.
Between agencies.
Police memorabilia is also exchanged between police forces themselves. The exchange of patches has begun to be seen as a sign of respect and cooperation between agencies since patches came into more common use in the 1920s for agency identity.
With the development of more modern communication between various law enforcement agencies, the trading of insignia has become widespread. One particular example can be seen at the NYPD's New York City Police Museum in New York City, where hundreds of police badges and patches are on display, including those from other American forces, and all constabularies of the United Kingdom, as well as forces from South East Asia and Australia.