Last winter I was "pulled over" walking in Palermo Soho/Plaza Italia. (~Paraguay approaching Thames maybe) I was texting and looking down. It was ~3am, I was cutting along Paraguay rather than heading to or from Santa Fe and it was cold. Because it was cold I had my collar UP and a "beanie" (wool cap) on my head. Apparently this is too suspicious to ignore.
I was stopped by a policeman who crossed the street to approach me and he was slowly followed by his partner.
This guy was all "tranquilo", but he wanted to see my "documentos". I showed him my drivers license from the States. Then he wanted me to empty my pockets. THIS is when I thought "This fucking guy is going to rob me." I had some cash and I had a small digital camera on me that night. I was sure he was going to try to take something.
But after talking for a while, taking everything out of my pockets and explaining that I was walking to Borges to walk down to Santa Fe because it was a well lit street, he let me go.