Here in Michigan, most any jurisdiction can hire and have a police department, Township, village, city, etc. Some may have only one part time officer (maybe a officer from another jurisdiction, on his off hours,) up to a complete department with chiefs, officers with titles, and regular patrolmen, detectives, the works. Depends on size of governmental entity and amount of $ available. Townships can also have a constable which would be an elected position. Constable would have to meet state training and other requirements like any other officer. Sheriffs are the chief law enforcement officer for a county, will have deputies under him. Elected. State police are just that - officers hired by the state. State also has motor carrier officers - state police with duties to enforce trucking rules & regs - full state police powers. Conservation officers, are state police - with all the powers of a state officer, but hired by the department of conservation to enforce game laws, and some environmental issues. These officers are often called upon to back police from other agencies when needed. Then there's the "oddballs," like college campus police, and tribal police. (We have an Indian reservation here, their officers are federal marshalls, but serve like local officers.) Now the interesting thing is how these officers duties overlap. Many of the smaller jurisdictions officers may carry a deputy's badge, and thus don't run out of power at their jurisdiction's border. Often officers are called upon to cross jurisdictional lines to back officers where necessary. Of course, an officer "in hot persuit," any follow you wherever he needs, regardless of borders. Don't know how this plays in national borders. Often if an officer has to cross jurisdictional boundaries to make an arrest he will be accompanied by an officer in the jurisdiction where arrest is made. Often jurisdictions overlap, like a city within a county. We have one small city locally with 5 police agencies within their boundaries - don't know who will show up for your 911 call! Then there are several Federal police agencies, Federal Marshall's service, FBI, CIA, Bureau of Firearms, & Tobacco, etc. But let.s not go there!
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