Well, that would be someone from the local police department, right? Maybe. Or you might want to go with a Sheriff or a deputy.

What's the difference?
A sheriff is generally (but not always) the highest, usually elected, law-enforcement officer of a county. He may or may not be trained in law enforcement. Once elected, the sheriff appoints/hires deputies to carry out the duties of the office.

A sheriff and his deputies have jurisdiction anywhere in the county where he is elected to serve, including all towns and cities located within the county, even if the town or city has a police department and a chief of police. The jurisdiction of the police department is limited to their town or city. The sheriff also assumes the law-enforcement duties in unincorporated areas, towns or cities that don't have a police force.
Deputies may serve as police officers or they may work in the county jails, courtrooms, and in the civil process department (which handles delivery of civil papers such as jury summons, subpoenas, divorce decrees, etc.). Only members of the sheriff's office can serve civil papers.
Most larger sheriff officers (or departments) have both uniformed and plain-clothes officers (detectives). Some sheriffs also serve as coroner.
So next time you're looking for a local LEO for your story, think about the local PD but don't overlook the Sheriff's Office.
Have you ever used a sheriff or a deputy in one of your stories?
Groaner of the Day: Snow White received a camera as a gift. She happily took pictures of the Dwarfs and their surroundings. When she finished her first batch she took the film to be developed. After a week or so she went to get the finished photos. The clerk said the photos were not back from the processor.
She went back again the next week, but again her pictures were not ready.
By the third week, she was feeling quite distraught and when told the photos still weren't ready, she began to cry.
The clerk, trying to console her, said, "Don't worry, Princess. Some day your prints will come".