David works in the police force. He is mainly in charge of crime prevention, detection, and maintaining order. He works at the rank of a .

Police officer

Explanation:

Hi, a police officer is a law employee of the police force.

Some of a Police officer's duties are:

Protect life and property by the prevention and detection of crime;

Proactively patrol assigned areas

Maintaining order through the enforcement of laws & regulations.

So, Davis works at the rank of police officer.

Feel free to ask for more if needed or if you did not understand something.