J. D. Tippet. I tried to find out what "J. D." stood for with no luck. For what it's worth, in my opinion, that probably means it was Jefferson Davis, a name still popular in some areas... but that no one would want to publish for all the world to see, nowadays.
Sagar is the name of the police officer
A trainee police officer can also be referred to as a police cadet or a police recruit.
it was officer dibble
You would call him/her the chief of police.
You would normally name the police officer (driver) and his employer, e.g. the city or police department where he works.
Officer Beaples
In most states the police officer that tends to the court room is a deputy sheriff. They are called bailiffs.
"Eugene Tackleberry"
It is possible that a police officer may give his name as P.C. if they are his initals. His full name should also be provided to the person for reference, however.
Police is a common noun. Proper nouns name a specific police officer or a specific police department. Examples: Officer Glen Martin The Glendale Police Department
Underclassman
He is a police officer, Jack.