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Because detectives work on a wide variety of cases, if you are interested in this field, you are encouraged to take a diverse course load. English, American history, business law, government, psychology, sociology, chemistry, and physics are suggested, as are courses in journalism, computers, and a foreign language. The ability to type is often needed. To become a police detective, you must first have experience as a police officer. Hiring requirements for police officers vary, but most departments require at least a high school diploma.