Which one is better?
The Police needed him for armed robbery.
or
The Police was after him for armed robbery.
Which one is better?
The Police needed him for armed robbery.
or
The Police was after him for armed robbery.
The better choice is:
"The police were after him for armed robbery."
You should remember that, in English, whether it be American, British, Australian, or any variant or dialect of English, "police" is a plural collective noun. An example of this is:
"The police are at the door, sir."