Assuming they had DNA to begin with...to compare it to. The defendants could have denied to go along with police so as not to incriminate themselves..without stating as much. That also assumes the much smaller parts would be found with any intact DNA left. I could go on...
Yes, there is no guarantee that the DNA is in a database, but there also is none that there isn't, so making a conscious decision to think you will evade capture by dispersing the parts isn't too smart. Also, they can cull DNA many, many years after a body is dumped.
Oh I know about the BTK killer getting caught, what 30 years later from DNA. SO yeah it can be traceable...but again. You still have to find the parts.
Personally, I'm more of a follow the law person, so not something I ever plan on doing. Just saying, it's a big ol' country. They were in Texas. Plenty of hungry coyotes and what not out in the sticks that would have made that evidence disappear if they disperse it far and wide.
It's not like meat would sit around long in the hot sun out in the backwoods without attracting some critters.
EDIT: That is if it's in small enough chunks to disappear quickly.
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