Do you like COPS?
Visitors to the Ginza shopping district can head down the street just a little further and find the Metropolitan Police Museum. It's located in this building - not hard to miss with the motorcycle out front!
The museum is located on the north end of Chuo Dori, the main shopping and tourist street in Ginza. Walk just under the expressway overpass and the museum will be on the right. It's open 10-6 Tuesday through Sunday (with variations on or around holidays of course) and has no English language displays, though you can get an English booklet.