Assuming you're talking about grammar, no, it's "the police have a duty."
Yes
In some states, an off duty police officer can write a speeding ticket. It will depend on the laws in your specific state. You can always go to court to fight the ticket.
"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."
Police are
Police presence is simply an aura of the consistent presence of police in a particular area. It can also be the effect of increased police patrols in an area. Someone might write: "The increased presence of police in the neighborhood resulted in a dramatic drop in crime."
Police car, or Police Department.
Police typically use metal handcuffs in their line of duty.
duty
Yes.
The difference between a civil server and the police are police of powers on and off duty where as civil servers such as security guards and rent a cops things of that nature have power only when they are on duty. This is not really correct. I don't think the poster read the question right. A civil servant is someone who works for government: city, state, township, etc. Not including the military. So usually police officers are civil servants.
Yes, police officers are allowed to exceed the speed limit while on duty if they are responding to an emergency or pursuing a suspect.
Yes, police officers are allowed to exceed the speed limit while on duty if it is necessary to respond to an emergency or pursue a suspect.