Chinese Police are coming to your country?!?!
If a classic car collector bought an old British or German police car and drove it in California, with a valid California license plate that does not start with a letter E (as in Exempt, i.e. government vehicle), cops won't do anything.
Likewise, if a Hollywood film production drove a fake prop police car on highways to a filming location, that is entirely permissible too, even if it may intimidate immigrants along the way.
What the guy did was mean and stupid, though.
Movie prop cars also display a decal (magnet that sticks to the car) that identifies the movie prop company, but that's hard to notice from distance.
Of course their license plates are real and standard ones.
One thing these cars are not allowed to have is blue flashing lights (prop cars use white lights, which will be turned blue using computer during edit).
There used to be a prop car company near I used to live and those cars can fool people from across the street.
Blue light is reserved for government emergency vehicles only.
You'll also notice private ambulances don't have blue lights (usually just red only or red and yellow) for this same reason.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko