All of a sudden I felt a hand on my left shoulder

It happened in 2022 - I can't remember the exact date but I guess it was at the beginning of winter.
I was stopped by the police right in front of the station, at the bus stop, where I was sitting on the steps (at the station entrance) waiting for a bus to go to work. The bus was due in 10 minutes. All of a sudden I felt a hand on my left shoulder, somebody's hand, and when I turned round I saw a policeman who asked me to show him an ID document, and before I gave it to him I asked him "is it proper to touch a person in this way, without their consent"? He didn't answer and just kept on asking for my ID. Then I gave him everything he needed, respectfully, and after the check he went away, leaving me there at the bus stop.