What is the difference and similarities between state,local,federal, and county policing agencies?
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their jurisdictions, and their source of budget money.
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Call the state level of FBI...if there is no response, go higher.  Happened to me when a guy was stealing mail from mine and other mailboxes.  The locals wouldn't do anything.  I called the post office, postal inspector, and the postal inspector caught the guy on film.  Still, the locals wouldn't do anything, so I called the DA and told him that the guy had been caught on film, and the DA did some serious leaning on the Sheriff's department.  Local people are sometimes lazy, or they are good friends with other locals, so get someone leaning on them, and they start cooperating quickly.
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Try this site:\nhttp://dir.yahoo.com/Society_and_Culture/crime/law_enforcement
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State and Local g-ments are to manage conflict.  Feds are to provide functions (defense, etc.), to set guidlines and oversee state and lcoal g-ments.
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Plot device.  It creates a nice little sub-plot if you can provide a mean old arrogant g-man as a foil to your hard-working, down-home beat cop.\n\nFrom what (admittedly little) I've read about the interaction of law enforcement agency, there really isn't a lot of competition between state and local law enforcement.  Usually, when the FBI is called in, both the police and the agents want as much cooperation between the two as possible, because bickering slows down the investigation.  Part of "getting along" requires good diplomacy, and everyone gets proper credit in the news.
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Usually your local law enforcement will have listings, either on their web site or in person depending on individual state laws. One site listed below also provides a search service for a fee, while the other is a clearinghouse for information.
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Please note -- the greater majority of crimes are local crimes, not federal crimes.  It's not the duty of the federal government to make sure that state and local laws are enforced.
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You need to be a little more specific.  What do you mean by various levels...levels between ranks or types of agencies like local vs. state vs. federal?
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It depends what your state you are from.  They are the same thing.
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Local, county, state, and if it intersect a federal case the federal level
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yup criminal justice is diff in diff countries...but they all have the same goal...to catch the bad guys
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Everyone's replies are absolutely correct.  I found a page from the FBI site that lists the location of the web site for each state though there may be individual sites for bigger cities.
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On this website you can find EVERY police Dept for the state of California, I hope this helps.\n\n http://www.usacops.com/ca/
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Mostly crime lab support.  It is very hard to get an entry level federal job.  Most entry level jobs are with city and county goverments.  Best place to start for the county that has a big city (e.g., Los Angeles county not Los Angeles city).  The salaries you quoted sound way to low (assuming you have at least a BS degree).
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MAY I SUGGEST GOING TO LOCAL LAW ENFORCEMENT OFFICIALS BEACAUSE YOU CAN GET MUCH INFO ABOUT THAT ON HERE
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Yes.  I work with a few different local police departments and I trust all of them.  As for the city I live in, I do, very much.  There are some great officers there and they are respectful and caring.  They try and do the best they can for the community.  The chief is awesome and backs his officers.  We don't have a lot leave from there.
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Ask you local police department.