Law Enforcement & Police - 1 Answers
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In most, if not all, police agencies in the US, you must first be a police officer before becoming an investigator. My agency requires that you be a patrol officer for at least two years before you can apply for transfer to a specialized unit such as investigations, K-9, etc. And in order to be a police officer in the US, you must first be a citizen. If you're from Greece, you would need to apply for US citizenship, then you may apply to be a police officer. Studying criminal justice certainly helps, but it's not the only requirement.