Sorry, jt, but knowing a crime was committed doesn't increase the odds that blood matching the type of the owner (or possessor) of an item and a victim of said crime being the victim's instead of the owner/possessor's of the item. IOW, just because Jessie and Michael have the same blood type doesn't mean that the blood on Jessie's shirt is more likely to be Michael's than Jessie's. Occam's Razor would indicate that the blood is most likely to be Jessie's. The same is true about Jason vs. Stevie's blood on the pendant.
The American Red Cross provides information about blood types on their website:
http://www.redcrossblood.org/learn-about-blood/blood-types
Since all of the victims and all of the WM3 are Caucasian, let's focus on that race's breakdown for blood types. As it so happens, according to the autopsy report on Callahan's, all four of the people we're concerned with have blood type A+, which they share with 33% of the Caucasian population. If the Hobbs' mtDNA is not reliable enough to consider him as the donor of the ligature hair (which
excludes 97.5% of the population but
includes TH), how can you consider the blood type matching in this case (which includes 33% of the Caucasian population) to be any kind of proof that the blood belonged to the victims rather than the person who owned or was wearing the item containing the sample of blood?
All blood typing can do is
exclude someone as the source. Blood type alone cannot determine conclusively the source of said blood without further testing. The sample from the pendant was destroyed. I don't know if the blood on the T-shirt was retested, but it could have been as part of the State's "secret" testing. As they didn't release the results of that testing (which occurred well before Judge Laser put the gag order in place), we don't really know about it. However, logic tells me that,
if said testing had been conducted by the State, and said testing had produced results stating that the blood on the T-shirt was a match to Michael instead of Jessie, the State would have released that information.
BTW, since Michael and Stevie have the same blood type, does anyone know why the blood on the pendant has always been said to be either Jason's or Stevie's and the blood on the T-shirt has always been said to be either Jessie's or Michael's? I understand the Jason and Jessie connections as they were the owner/possessor of said items. But the Stevie and Michael connections, IMO, were simply the prosecution's attempt to prop up their case because Jessie had claimed that he chased Michael down and that Jason had been the one to attack "the Branch" boy. Since Chris' blood (which would be much more likely to have been on things, had Jessie's story been true) is O+, none of the blood could have been his. Another very strange circumstance, don't you think?