A question of etiquette

Wednesday is trash day in my neighborhood, so when I walked out the door this morning I wasn't surprised to see that the street was lined with trash cans. What did surprise me was the fellow who drove up in an SUV, parked illegally, then pulled a hefty bag out of the back of the truck and dropped it into an already overfilled receptacle.

After he drove off I was tempted to walk over and check to see if he had left a body. I didn't, though, because it seemed to me that examining the contents of my neighbor's trash can would be unthinkingly impolite. What say you all?