Traffic police's arrogance of power

The other day I was returning home from work at 6.00 pm when suddenly a traffic sergeant stopped my car which had tinted paper only on the rear windows. He asked me to remove this paper immediately, and without any delay I followed his instructions. My driver removed the tinted paper on the spot.
But the sergeant was behaving oddly and he snatched the car papers. I felt that he might be expecting bribe. So, finally, I asked him directly: “How much bribe do you want to let us go?” But it hurt his ego. Without a word he filed two cases against me. One was for tinted paper and the other for 'not following' the instructions, resistance and refusal to provide information.
My question is, what was the instruction that I had not followed? I certainly did not resist in any way! My crime was not giving him bribe. When this is how policemen behave, is it a wonder that murders and disappearances happen on a regular basis? While criminals are roaming freely, ordinary citizens are being harassed by the members of law enforcement agencies.
Saima Kamal
On e-mail