I'll avoid putting my foot in my mouth just yet, but may I suggest one of the best foundation books I can think of on the topic:
Police: Streetcorner Politicians by William Ker Muir.
IIRC, the text can be found on Google Books. Just search for the title. It is missing some pages, but you'll get the idea.
It is a great read and I think it really lends some perspective to the job; I'd recommend buying it for like $8.
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