I agree that it is a community wide issue that has unfortunately been going on from day one. It is true that nothing can be done without evidence and even then, its definitely a battle. Thankfully whatever dog was pooping in my yard is now gone but others are still around pooping elsewhere. My suggestion? Carry one or 2 baggies with you and if you witness someones dog pooping, offer them a bag to pick it up. I know its not necessarily the best solution, but for me it works without being too confrontational about the situation but still making our point crystal clear to the violator. The biggest thing is, you'll at least get people that care to react and start doing the right thing. As for others... they will never care and will continue to be inconsiderate in which case there really isn't anything we can do except keep calling them out on it until they wake up.