The police are members of the "Executive Branch" of government, and as such they are charged with the responsibility of enforcing the criminal laws passed by the "Legislative Branch" - investigating crimes and offenses - identifying and arresting offenders and - presenting them before the "Judicial Branch." A very overly-simplified explanation but, entire books have been written that cover this topic.
Management.
A police role is to serve and protect the people and to maintain the peace and order.
The role of police in contemporary society
The role of the nigerian police is to investigate crime in the country.
the authority
Police school
The same as any other police force?
The role of the police at night is to provide law and order. They are supposed to provide security to the people who are sleeping.
to protect and to serve
The most secure place to view police videos of them capturing criminals and doing other things would be on a TV show that covers the activity or police like Cops, or by watching the news.
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When police get in trouble for stereotyping, it reinforces the stereotype that police tend to view some races differently. Of course, this stereotype of police is just as unfair as the racial stereotypes.