dkatana writes: For many cities one of the biggest cleaning expenses is dealing with dog poop. While it is impossible to ask the birds to refrain from splattering the city, dogs have owners and those owners are responsible for disposing of their companion's waste. The few who shirk their duty create serious problems for the rest. Poop is not just a smelly inconvenience. It's unsanitary, extra work for cleaning crews, and in the words of one Spanish mayor, on a par with vandalism. Cities have tried everything from awareness campaigns with motorized poo videos, to publishing offenders names to mailing the waste back to the dog owner. In one case, after a 147 deliveries, dog waste incidents in the town dropped 70 percent. Those campaigns have had limited effect and after an initial decline in incidents, people go back to their old ways. Which has left many cities resorting to science and DNA identification of waste. Several European cities, including Naples and one borough in London, are building DNA registries of pets. Offending waste will then be tested and the cost of the analysis charged to the dog owner, along with a fine.