But in this case, the culprits did choose to go out of their way to somehow get an object from BK (with his DNA already on it) or to place his and only his DNA on the sheath.
Would the theory be that these people or person chose him randomly (not realizing that he coincidentally drives around at night) or did they already know of his night driving? Seems to me the second is more logical, but I'm open to either interpretation.
The person who got "set up" is just one person - I'd be very surprised if it's completely random, it's a lot of work to go to, setting someone up. If I'm getting this theory correctly, the real murderer came pre-prepared to set up BK. The killer must not be driving BK's Elantra, because BK says he was driving it himself.
Does the set-up theory include the real murderer already possessing an Elantra (so they choose BK for his car?)
If it was random, that's unusual and I can't think of any cases of that type. If, on the other hand, the real murderer had a true grudge against BK, it would make more sense. To me, anyway.
IMO.
Oh, I totally agree. Either the real murderer had a tremendous grudge against BK (and still does and is hiding somewhere feeling pleased with themselves - and BK must have no clue who it could be, which is weird) OR they went to a lot of trouble to frame him, which I find it spectacularly difficult to believe was just a random choice to cast suspicion away from themselves. And what was BK doing, that made his epithelial DNA so available to someone? In what context could it even have been collected and then placed into the snap? If it happened that way, this has to be quite the long term criminal, I'd think.
And clever to the point of Evil Genius, since they managed to keep their own DNA mostly off the sheath. The Defense really should demand some further (consumptive) testing of the rest of the sheath if they suspect this (but they haven't, so far as we know). Because the real killer would have had to have remained masked and gloved throughout this entire process. How the real killer could even find and know they had BK's DNA for this scheme is beyond me. It would be easier to say that some terrible person stole BK's knife (with sheath) while masked and gloved and did not know BK's DNA was lodged in the snap thereby accidentally implicating BK, rather than a set-up (to me). Both are hard to believe, though.
IMO.