Are they photos of the roofer actually pooping in Muffin 's yard? If not, then all you have is pictures of poop to be added to your collection. If you’re going to accuse a specific roofer or a roofing company, you’ll need more evidence than a picture of a poop.
(Collection of Muffin yard photos, not collection of poop photos.)
DNA.
Shit on a shingle?
You’ll also need to somehow force a DNA sample from the roofers. And maybe the neighbors. And any homeless people in the area. And any irate former clients/associates of the roofing company, it’s employees, and maybe any irate former clients/associates of Muffin. Is the yard fenced? Could a delivery service employee have left an unexpected deposit in the yard? How much does a DNA test cost? Is there a group discount?
I’m in favor of plan “A” but plan “B” can get really expensive.
What would you expect to win once you’ve ID’d the mystery shitter? An apology?
How much could you expect to pay the roofing company if they win their libel suit against your unproven claims?
Does it make sense to pay $1000+ to recover a $100 debt?
If he does have pictures of the roofers pooping, he could certainly have them charged with indecent exposure!
Preferably, your hind’s in the gutter.
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Someone mentioned the roofer filing suit for slander/etc. I was just suggesting one possible defense. Collect the feces with a witness or two present, submit to a lab for DNA. Ask the roofer in court if (s)he would be willing to submit DNA. No, IANAL and may be full of shit. Anyone?
If you’re full of shit, stay out of Muffin’s yard.
Sorry a roofer pooped in your yard. Next time it happens, make sure you catch him right after he does it and rub his nose in it so he learns not to do it again.
It helps if you’re built like Hulk Hogan.
I just want to say this is one of the best thread topic/username combos ever!
Holy crap, their video says it’s 30-50 bucks per test. Around here DNA paternity tests run over $800. If I ever have a client looking to save some money while fighting over custody of a really hairy child . . . 
I just spoke with my neighbor who is now back in town. He’ll be dealing with the roofing company on the issue. 
Up until this point, I always thought the term “flying buttress” was a peculiar choice of words in roofing design…
Newspaper typo: "The bride is approximately eighteen feet wide from buttress to buttress. "
This might help if they plan on kids… 
Myself, I pit poopers who roof in my yard.
It just dawned on me. This is about a meadow muffin in Muffin’s meadow.
Your roofers bring all the poop to the yard
And they’re like
It’s better than yours
…