I don’t recall any official announcement that Tyler had DNA from multiple sources in his blood, though there were all kinds of rumors and speculation occurring then. Even if he did, I don’t see what relevance it would have to the Perez situation. The speculation was not that the bags were switched, but cross-contaminated--that Tyler put his blood in a bag that had previously contained Perez‘ blood, and which had not been either discarded or washed out after use. If the amount of contamination was low, it would not cause an adverse reaction, but could still be picked up in a DNA test. Also, one of the peculiarities of the Hamilton case was that one of the blood antigens that tested positive for HBT was in much lower than predicted amounts, which might be consistent with contamination.
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Would they be so cheap to actually re-use a bag, any bag? That's stupid piled on top of STOOPID.