@10ofRods , re the idea that the latent print didn't have a more bloody print right before it and a less bloody print after it --
I was trying to envision how this could happen, and pictured something like this: Killer is leaving, holding the bloody knife. Maybe he's trying to use his hand/s to catch any blood dripping from the knife, but for one of many possible reasons a drop or two of blood spills to the carpet without his notice and he steps in it.
Something like this is the only way I could imagine a print with blood when the previous step didn't have any, or not enough to register.
Does that seem possible/probable?
There's no way that a couple of drops of blood managed to get all over the bottom of a shoe, IMO.
Further, if there were really drops of blood (even 1 drop) and the PCA doesn't mention it? I am very skeptical. To me, it's just SOP and would have tightened up the arrest warrant like a square knot.
I don't believe there was a lot of carpet in this house, but that wouldn't make it possible for a shoeprint to be taken.
Even then, what you're saying is that there was enough blood from a couple of drops, at one place (drops would be one stride length apart if dripping from a knife while the killer was moving), and could make a shoe print. I believe the shoeprint shows direction of travel (and much else). One drop would do exactly what it would do in your own carpet or on your own floor - make a small fleck on the bottom of the shoe. I am not sure that anyone could even say that was a shoeprint (and that blood would now be squished into the carpet and likely no way to tell it was a drop any more).
Anyway, the dripping knife (which doesn't exist so far as any of us know) would have cast blood to the side of the walker. And the walker's feet would not be waddling from side to side so as to step in any of it, IMO. There would be more than one or two drops. I imagine he put it into the big pockets of coveralls, he knew blood drips trails and planned for it (probably though he had the sheath in his pocket until he realized he didn't - perhaps right after the second floor murders).
A shoe print that's partial would be said to be partial, IMO. LE did not lie on the PCA, IMO.
A latent shoe print resolved through amido Black is going to be one of the last in a series. Amido Black is a protein enhancer that allows a print barely detectable by luminol to show up. It has to be applied in a specific way to the area where a footprint is. The prior footprints were resolvable with just luminol, IMO.
The definition of "latent print" (shoeprint or fingerprint) is that it is not visible to the naked eye because the amount of blood (or other substance) is now almost gone. I do believe it was probably only one shoe (right or left) that stepped into the blood. I believe there is at least one bloody shoeprint before the latent prints, and that LE would not say they had a shoeprint if it was a partial - they'd say partial. Of course, I also believe if it were 80-90% complete, they'd just say shoeprint and that would be enough for good analysis to take place.
At any rate, there was a shoeprint in blood. I believe it was the blood of a murder victim. I also do not believe there were blood droplets from the knife, but if there are, the spacing of those would also give additional information about the gait and speed of the murderer as he left the house. I believe the shoeprint provided instant information about sex, weight and height of the murderer, which was a big step forward in the investigation (and perhaps the reason why early one, one LEO said the scene was "sloppy."
IMO.