First of all, the FBI is different from the general police department.
1, the US Federal Bureau of Investigation, the US Federal Bureau of Investigation, belongs to the US Department of Justice and is one of the most important intelligence agencies in the United States.
2. American police: every state government in the United States has its own police agency, which belongs to a kind of local police. The state police departments only enforce the laws of the state, and are not subject to the leadership and restraint of the federal police, but are responsible to their respective governors.
Second, they have different functions.
1. The function of the FBI is to investigate criminals who oppose federal laws, support laws, protect the United States, investigate intelligence and terrorist activities from foreign countries, and enforce them in leadership and law. Provide assistance to federal, state, local and international institutions, perform their duties, respond to public needs, and be loyal to the US Constitution.
2. The police in the United States undertake most of the important tasks of American public safety, including traffic, public security, patrol, detection and so on. American urban police law enforcement agencies are all under the jurisdiction of urban administrative agencies, but the federal government has no unified regulations on specific management forms.
Third, the scope of law enforcement is different.
1, the US Federal Bureau of Investigation, on behalf of the federal government, cracked down on certain types of crimes in the United States, equivalent to the "national police."
2. Police Due to the different laws in each state, the police in each state only have the power to enforce the law within the state or even within the county. If the suspect escapes from the border, cross-state law enforcement is not allowed.
Baidu Encyclopedia-American Police System
Baidu Encyclopedia-FBI