[Kequc]

There's no such thing as a slippery slope.

If you leave your windows open and aren't there then people can easily steal from you and then cost the public money. Nobody was penalised, simply contacted and asked to close the window on their car.

[katbyte]

However if they had not been able to contact someone:

> police is forced to tow the car in that case, if they cannot reach someone

[Kequc]

If they cannot contact you then you have been breaking the law. Why?

[Argorak]

You have been breaking the law before they contact you. They are just sometimes nice like that. In contrast to the

If you want to know the specific part of the traffic law: StVO § 14, 2 (safety when entering and exiting the vehicle) [http://dejure.org/gesetze/StVO/14.html]:

"Kraftfahrzeuge sind auch gegen unbefugte Benutzung zu sichern."

(Vehicles are to be protected against unauthorized use.)

Also, your insurance might not like this ;).

As I said before, the german law is much more build around responsibilities. This is one example.