This reminds me at the times, where GDR was still present until Nov89.
The Vopos are thought also they where half gods and act unpolite and rough like hell, especially to West-Germany citizens.
I was pulled over once on the motorway short before the west/east German border, they standing with 4 Vopos around my Audi 80, I had to open trunk, all doors, glove box, engine hood and the gas tank cap. That was less a situation to fear anything because I wasnt remembering had done anything wrong...but I did and you'll never guess what

:
It was a warm day, windows were open wide and a little louder German music was echoing outta the car, was from Marius Müller-Westernhagen, not really a protest song but the text was doubtful for the eastern.
To keep the story into the academic quarter: They confiscated the tape and warned me never to play or bring in this kind of music into the GDR again.
This stop was costing me round 1 hour into the afternoon heat.
After crossing the border and was safe onto my western side of life I couldnt withstand my inner urge, turned onto a near parking, open the trunk and turned the music as loud as the speaker could muster, jumped onto the trunk and yelled S U C K E R against the east side of Germany!
The western border guards couldnt stop laughing and luckily that was long before cellphone phototime, othertime I surely would have an uneraseable memory on youtube
Aside from that: The German police never would act like your cops do! Thats very near the knuckle and Im not sure what to do if I was treated here like you described it.
Ah, before I forgot: Banned!
