I dont have a lot of faith in DNA versus a body. Small samples can be destroyed in one test. Which means that other labs cannot verify your work with tests of their own. Samples get contaminated or lost as well.
DNA will absolutely do it if we can get through the hoops and loops. But a body bypasses all that.
But if DNA is all you have???? Its light years ahead of a plaster cast or grainy photo.
For the reasons you state in your first line: plaster casts or grainy photos are, if I am a scientist in a relevant field, far better than a DNA sample.
For the latter I'll say: where's your type specimen? Don't have one? Contamination is my clear dismissal.
I have to explain casts and photos. Experts have virtually verified that the provenance of Patty and many tracks is an unlisted species. The problem is that the society isn't holding science's feet to the fire for that alternative explanation...that they do not have.
That evidence leaves clear markers that rule out a human as the subject, and make fakery such a farfetched explanation that it isn't one.
DWA, Southern, and Norse can you expand your comments to improve clarity?
If bigfoot were anything other than (technically) human, it would be divergent enough to be distinguishable in relatively small amounts of mtDNA. That would be one way to prove they exist with multiple biological samples. If my theory is right, being that I think that BF is from the genus homo and developed an entirely different survival strategy, then it's DNA may appear fully human but may have subtle (seemingly random) mutations that affect gene expression more than actual sequence which could look like ordinary human variation. Without deep study those kinds of things may never be fully identified.
I have my doubts that if a specimen were in hand, we could persue the study of it unfettered. As soon as "human" DNA enters the picture, the ethics and protocol changes. Ownership of the specimen can then be challenged. Genetic sequence data then cannot be shared on a public data base without written consent of the donor which then blocks independent review.
So you could prove it with a body, but you might not be able to keep it long enough..... Besides, the existence of wildmen is a crazy scary thing to drop on the world, even though Grizzly bears are likely more dangerous.
I just had a crazy thought. Lets assume that BF is indeed some tribe of relic human with language. We all conjecture if the government knows they are there. What if the Government discovered them, actually made contact, and offered them the same protections as the Bureau of Indian Affairs. My crazy thought is, if BF watched what happened with all the other Native American Tribes: land stolen, displacement from traditional lands, reservation system, etc might a sentient BF tell the government they are not interested in protection and to leave them alone? That might explain some of the strange wilderness areas that simply pop up without any publicity.