Police control

When I went to school this morning, I was stopped by the police. They wanted to impose a fine on me, because my music was “too loud”. Their closed disks would have “weaked” while driving by (my were also closed). That is allegedly forbidden?!? Is that true? May I not make as loud as I like it? And then they said that my reflectors were too small. The one where you have to install when you have black rear lights. Is there a standard? 2cm wide and 1cm high? Are they really too small to be able to impose a fine on me? Does someone know? Because they said that the next time they catch me with loud music and the current reflectors there would be a fat fine?!? Is that so??? MfG golfgtspezial