Based on dassey trial transcripts, there was a 3x3 - 3x4 patch that tested positive for luminol. This was I believe on 11/7 or 11/8.
Defense asked in cross examination if the blood had to be human, or if it could be for example from a deer. Expert agreed that it could be a spot where a deer or other animal was butchered.
The problem with bleach and the other things allegedly used, they make the DNA unusable for testing. I was completely unaware of this until now, and I've watched alot of crime tv! But even after using chlorine bleach and if the dna is unusable, the blood or whatever is in it will react to the luminol and light up
The expert explained that you want to make sure that you have collected all the forensic evidence before using doing this because it can contaminate some evidence. I believe it was said that they weren't able to visibly see this patch on the ground, so they didn't try to get dna samples BEFORE luminol testing. My assumption from there is that they then were not able to collect usable DNA from those locations that tested positive with luminol.
So end result is that it wasn't a DNA match, and I didn't even get the sense they actually found DNA to test.
I could be wrong, but based on my limited understanding, that's what I believe to be the case.
Someone earlier on this thread posted about bleach and cleaning up blood, she's researching because she is a writer. She posted links to information that some I could understand enough, and others way over my head.
Edit -- I take that back. I think it was said that chlorine bleach would not make the DNA unusable. Maybe whoever knows about this can reiterate, I admit I am unsure now. Paint thinner and gasoline was allegedly used, have no idea how they know that, or if that's just an allegation. But all I know for sure is that the luminol testing was positive on that 3x3 / 3x4 spot
gasoline and paint thinner were brought up by Dassey and came from his confession. Paint thinner especially would not be a very effective way of cleaning a crime scene. They mention cleaning as early as the first 2/27 confession:
pg 462:
"I heard he told you how he cleaned things up. Be honest, if he didn't it's ok but if he did, you need to tell us"
(pause)
"You didn't see it, did he tell you about it?
(pause)
"No? Say yes or no" -No
Here is the context in the 3/1 confession:
pg 542:
"Cuz, I already know you were in the garage and stuff apparently cleaning up and stuff so tell us about that"
(nod yes) -Well he was working on his car and like he did something wrong and then he like poked a hole in something and then it started leaking. And then later on when cuz I was helping him before I went over there a little bit
pg 606:
"Um, when you get the bleach on you, let's talk about that, he thanks you for helping him and then what do you guys do? -Well that's when my Mom called
pg 607:
"What time is it when your Mom calls" -Like 9:30
"Ok so what do you do between 9:30 and 10" -We watch TV a little bit, talked, about that he was glad that I helped him cuz he couldn't do it by himself
"When do you clean the place up" -Like at 9:50
"Tell me, what do you do?" -He took the bedsheets, took em outside and he burnt them
"What else did he do" -He hid the, that's when he hid the keys and then
pg 608:
"And what else did you guys do?"
(pause)
"Where's her clothes at this time?" -In the garage
"So how'd they get out in the garage?" -When we went out there to clean up that, the blood
"When did you do that?" -Like 9:50
"So you and Steven do what at 9:50 then" -We cleaned that up and then he told me to go throw that on the fire
"Throw what on the fire?" -The clothes, that's full of, the, the blood that was like cleaned up
pg 609:
"So what'd you do in the garage now? What kind of cleaning do you do, how do you do it?" -We threw gas on it so he could get it off. Then he tried paint thinner and then he went to bleach to get it off and like, he like, probably like, he went like he was spraying it like. I thought he got it on the floor and it splashed up on my pants or something
"How much bleach, no let me go back. How much blood was there on the floor, quite a bit?"
(nods yes)
pg 610:
"Were there multiple spots that you cleaned in the garage or just one?" -Two
"Where'd you get the bleach from" -In his house, by, in his bathroom
"Was Steven bleeding?" -On his finger, that's it
"Did Steven know he was bleeding?" -Yeah
"Did he make any comments about that?" -Well he just went in the bathroom, he got a band-aid, when he went to get the bleach