Hi beeseeingyou, i'm new to websleuths but not to truecrime so yes, i am aware of several cases where DNA was planted and/or the police evidence was tampered with or rigged in some way. However I feel in most of those cases there is evidence from the beginning either of police incompetence OR of a very clever person in the vicinity who is obviously so. I'm not in the court (though i walked my dogs past it three times yesterday and saw some involved outside) and have no idea of the full evidence, so i can only really speak to what has been seen in the press. But from all i HAVE seen in the press i just cannot work out how TM could have done this without being an absolute criminal genius, and i just can't see her as that. If the accused had said SHE had taken/kept his clothes for some reason, it would make me think she had been planning a set up (I know he said she had his hoodie, but it was the one item without evidence on it, she could have covered it in blood and DNA from victim and accused, why didn't she?). Or if he'd stated sex between them had stopped but she suddenly initiated again (because she had her plan perfected and needed his DNA that night). Or if he'd said they'd never had sex before and she sought him out that night, or never used condoms but did that night. But he makes it sound like they did as they always had done and THIS time it turned out she was framing him for a murder. It makes no sense to me, as i think in most murders of children a parent is involved, and she had ongoing access to Rab's DNA and probably semen. Why frame this random teenager and risk being caught when police are actively expecting it to be someone in the family of the child?
I do take your point that sometimes things are not as they seem, i just think that in this case they are.