[kurthr]

Japanese police are very rarely willing to even ask to look at any of the disorganized hodgepodge of private cameras for property crimes or even minor physical altercations. They are far more likely to rely on personal accounts. TV dramas not withstanding.

Although Tokyo does have a system of traffic cameras which log traffic movement and license plates, that's most all that it does. Except in cases of murder or kidnapping (or political influence), it's quite rare to request the recordings of many private cameras. Outside of big cities, it's even more rare.

The largest connected system of cameras I'm aware of are for the subway camera systems (Shinjuku, Shinagawa, etc). Although independent systems, together they can do facial recognition to track individuals. Not a lot of AI yet, though.

In Tokyo, it is not uncommon to see bikes parked on residential streets with keys left overnight in their wheel locks (as if there aren't even mischievous 12 year olds?!). Oh, and outside of the cities, crime is even more rare. It is common in youth hostels for there to be open cubbies where personal items are stored in the front near the door. Nothing is taken. Most common thefts are: umbrellas (considered a fungible public good?), unlocked bikes (in high traffic business areas), women's underwear (off of outdoor drying racks).