Jinan Police Museum is a small specialist museum tracing the city's police history from the early 20th century onward. Displays include Qing-era police relics and material on the formation of the Jinan police force in 1902.
It is a niche stop, but worthwhile if you are interested in civic history or unusual local museums. Pair it with the larger Shandong Provincial Museum or other east-side sights rather than crossing town for it alone.