Do Police Officers Have To Live In The Same City Where They Work?

It is so expensive in my metro area that I wonder how police officers, teachers, and firemen are able to live here. So I wonder whether police departments allow their officers to live outside of their jurisdiction in areas that have more affordable housing.
Update: I'm not an officer and not built to become one. I bruise too easily. No, but seriously, I was wondering whether police departments could help their officers, because it's tough out here with this economy.
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