Police are
call a policeman or police officer. Call the police force.
it really doesn't matter which one you use
Assuming you're talking about grammar, no, it's "the police have a duty."
sheriff is like the police thing sheriff is like the police thing
"The" is the correct article.
squad
False. Traditional police lineups don't always identify the correct suspect.
It seems to be 'I call the police' but I don't think it's correct French.
"Police" usually refers to a body of people, so the term is usually plural. "Were" is correct, e.g. "The police were present at the scene of the crime."
Your parents determint that. They should contact the local police to find out if there is a local or state age limit.
read the manual!
Contact your local police for a current and correct answer