I love it! I once caught someone allowing their dog to poop on my front lawn - I was working at my desk and saw it from my window. I opened the window and said “I hope you’re gonna pick that up!” and they sheepishly apologised as they bagged it up. Satisfying.
How does one find out or know for sure what car, parked at which address, is owned by which dog’s owner?
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I can just see the inevitable lawsuits from people arguing that the tested dog shit was contaminated with their dog’s DNA that was picked up and properly disposed of earlier.
When going on a long walk, it’s not especially onerous to bag and carry your dog’s leavings (Pluto is a master at taking a dump early on), but it’s not such a big deal. Somehow we manage to carry it back home for disposal. Dog owners who just leave it out for the poop fairy (and to a lesser extent, those who dump the bag in someone else’s trash) are wretched humans.
I’ve never had a dog so how does the poop get in the bag? I’m guessing the human picks it up using the bag as a glove. Sounds wretched and smeary and stinky. Or does anyone lay out an absorbent disposable cloth 
the dog shits on then you pick that up and put in a bag.
Horses have manure bags how bout dogs?
Yep. Our dogs have nice, solid poops. Easy peasy.
That’s a good reason to monitor their diet. What about a poop neutralizer that would dissolve or neutralize the crap so you can leave it there. Still not nice to come across decayed poop remains in public but better than poop bags littering the park or trail.
Yes to the “glove” method. If you can’t manage this, don’t get a dog.
My dog gets a walk every morning, we have 2 routes we take. On these walks I take a plastic bag of some sort (bread, bun, bagels bag) and a dollar store metal spoon. Besides picking up my dog’s deposit, I pick up other piles too. I find these piles on sidewalks, the local middle school running track, a grade school playground and along a public trail. This morning was what I consider a good day, I only found 3 piles left behind plus one bag of poop. I have found as many as 10 on bad days. The dollar store spoon? Fantastic tool for picking up poop. Much easier that the glove method especially when dealing with multiple piles.
Reusing bread bags etc is the more environmentally friendly method than buying single use thick waterproof poo bags. Biodegradable poop bags also a good choice but perhaps a little iffy.
I have no plans to get a dog my three cats are already on thin ice here. J/k. 
IMO, as a very general rule, you can count on people using such leashes to be the least considerate dog owners in all respects.
One of my best buddies had cats. i always had dogs. He could not imagine picking up a dog’s poop. I could not imagine having an animal shit and piss in my house. Takes all kinds.
Also, in the same category as “my shit doesn’t stink,” for whatever reason my dog’s fresh shit is no big deal, while some other dog’s shit has a definite ick factor.
In our neighborhood, every morning when we walk there are fox turds on the sidewalks. Why the hell do they shit on the sidewalks?!
Same reason cats run OFF the hardwood/tile/linoleum so they can barf on the rug or carpet.
Our cats only do that if it’s 3AM; they learned that trick from our smoke alarms.
I discovered, during a very cold Minnesota winter day, that a filled doggie bag makes a good hand warmer if you put in your glove.
I wouldn’t recommend any of that those last two.
Unless you buy the bags yourself and are extremely sure of their quality, um, some of them are either porous or frightfully weak or tend to biodegrade the minute you use them.
Even swinging from your dog’s collar … creates a risk that I’d rather not contemplate.
I tie the full bags, and then hold the bag by slipping two fingers just below the knot. I carry it that way until I have an “according to Hoyle” disposal opportunity.
Haven’t had any problems that way.
I’ve had problems with bags in Sam’s backpack, my backpack, in the back of the car, in my pocket, tied to his leash, and just about every other imaginable which-way.
The North Face isn’t making these bags for rugged people to sleep in on a Karakoram trek 
I’ve never encountered such fragile bags, either the ones we buy or the ones we grab in public. One time, a couple of decades ago, I was carrying the bag and absentmindedly started twirling it by the end above the knot. Yeah, that one failed. And I’m generally not going on hugely long, aggressive hikes. Bag in jacket pocket has never been a problem in at least a few thousand reps.
I’ve only ever seen manure bags for horses that are pulling something like a carriage & they’re on the carriage under the horse’s butt not actually attached to the horse.
Speaking of horse’s asses I hate the frickin’ ones on top of the horse. I spoke to a park ranger, the pooper-scooper laws do apply to you, & don’t give me some bullshit (heh) about your beast doesn’t eat meat so the poop isn’t as nasty. I still don’t want to step it in & there’s a lot more horse shit than dog shit in a single poop. I have two choices on the otherwise nice single track trails, leap over a huge pile if you were nice enough to stop while it shit or or jump back & forth for 15’ if it was doing the horse equivalent of walking & chewing gum at the same time. I swear I’m going to start carrying latex gloves & pelt the asshole on top with what came out of the one on the bottom!
Hmm. While i can’t say i like stepping in horse shit, i admit that i think horse shit is just a feature of trails that are used by horses. And i don’t ride, so it’s not like I’m saying that in my interest. And horse shit isn’t nearly as gross as dog shit. And neither is as disgusting as a tidy bag of dog shit. There’s something so jarring about that. I really despise finding parcels of dog shit when I’m walking.
My sister’s leash has a thing to hold one of those bags. There’s really no excuse for leaving them lying around.
I think walkers think bags are compostable but also see my trash-picking crew coming three times a month down their block. We walked in front of a mom and her kid and the kid threw some wrappers. The mom looked at us and said “Ooh Bleep no, we’re not leaving trash for these fellas to get!” Her loud accent made our team members laugh so hard when she said it.
What did that person do wrong? So the dog pooped? They had a bag, how do you know they wouldn’t have picked it up? If they had started walking away you’re be totally in the right but as you described it you just yelled at them for no reason.
“thick waterproof poop bags?” All the dog poo bags I’ve seen are thinner and more flimsy than anything bread or other food comes in.