What was this cop doing?

[Doc]

Let me tell you the exact scenario.

He asked for her number.
She refused to give it.
So he took the plates as a momento.
An theres your story dj!

For the car to be registered the plates dont have to be displayed , just the rego sticker.
The plates are for the purpose of identifacation and have no actual bearing on being registered.
If the plates are in the possession of a police officer then its still registered , because it will show on there computer system.
Its like a liscense , a officer can hold your liscense , even though he has it you are still legal to drive.
also he may have just been nice and allowed the ladie to drive the car home or return it to its owner ( if she borrowed the car)