We have this in the UK and my understanding is if a car removes their plates or uses a plate which is invalid it will be flagged up and they will be inviting police attention.

Although, I think where this comes into play most is that in the UK our police cars are also fitted with the same technology so if a car has a valid plate which doesn't match their vehicle or simply has an fake plate they will be immediately pulled over, so you'd be kinda stupid if you were driving around frequently committing crimes with fake plates on.