"A law enforcement agency (LEA) is any agency which enforces the law. This may be a local or state police, federal agencies such as the Federal Bureau of Investigation (FBI) or the Drug Enforcement Administration (DEA). It could also refer to a national police force such as the Serious Organised Crime Agency. Also, it can be used to describe an international organization such as Europol or Interpol".
Ok, but these are all police authorities. The reason behind my question was the fact that I often come accross the phrase "police AND law enforcement agency/jobs, etc.", so I have difficulty translating it.
The FBI is not considered a police department, but is considered a law-enforcement agency. Similarly, the Customs Service or the Immigration and Naturalization Service are not "police", but are law-enforcement agencies. In the United States, policing is considered a function of local government, and not the national government. It is also seen as a general authority, and not limited only to the enforcement of specific laws.
The fact that someone is not a sworn officer has no bearing here; a non-sworn civilian clerk employed by the New York City Police Department works for a police agency, while a sworn United States Customs agent works for a law enforcement agency.