Which is not true. Police has nothing to do if the plates are suitable for competition or not. They are just following traffic rules. After scrutineering they have noticed to organiser which plates are not valid. It was on the teams to manage it. All plates were OK for police for Thursday, otherwise they will not be allowed to pass the scrutineering and also not allowed to participate on shakedown (all involved cars were there). Only these four competitors has used "wrong" export german plates, so when the car left Germany, they cannot come back... Pure mistake/ignorance from the teams...