Yes, Patsy. I encountered that in beautiful forest in Utah. Fools!

As for the plastic bags with the poop in them, I've decided that it's probably kids leaving them about. This is how I visualize it.

Parent: "This is your dog. You wanted it, I didn't. Now take that plastic bag full of poop down do the dumpster at the church-restaurant-shop (whatver.)"

Kid, who has been playing computer games and is sulky at being yanked away, sets out for the dumpster, full of resentment. On the way, he spies somewhere to stash it. In a rosebush, under the paper recycling bin, wherever.

He stashes it, thereby saving himself as much as a block of walking.

The thing to do when you see that is say, "Kids! What a brat!"