Where I live the government provide special bins called Robidogs with free bags incorporated into the bin. They are frequently placed and plentiful.
We have one 100 metres from our door, next to a small utilities building and a bit of waste grass. Our garden borders onto it with no fencing.
Our garden and the adjoining waste grass is always full of turds. The kids here go sledging and end up crying and covered in shit. The man who lets his dog do this lives about 500 meters down the road. He doesn't ever take his dog for a walk, he brings it to shit twice a day and then goes home. I've seen him on the waste ground but never my grass.
THE FREE BAGS AND BIN ARE RIGHT INFRONT OF HIM!
On Saturday evening we were having a party. A few people stepped out onto the patio, myself included. Mr Turd Dodger's Labrador came bounding up the side of the house and squatted to leave a big steaming shit on the lawn in front of all my party guests.
He came after it to put the lead on, turned the corner and saw 5 people on the patio staring, and a load of people looking 



through the French windows.
His reaction? He threw the chain lead at the dogs head, and kicked him off the lawn. Then tried to kind of joke shrug "dogs, hey? What can you do?" like it was the dogs fault for squatting on the garden (like it does nearly every day) and not picking up his shit.
He hunted round a bit, but he was looking for the lead!!! Then he walked off.
I am trying to persuade DH to go over and curl one out on his lawn, a la Me, Myself and Irene.