Mysteeri, I'm glad you asked this question, because for my money, it goes right to the point of it.
Yes, you would assume that PR/JR fibers would be found on her body an clothes. The problem is, they were not. No report, from the police, the DA's office, the Rs' experts, etc., exists which claims that parental fibers were found on the body or clothing. THUS, the logical conclusion is that the reason those fibers ended up on the tape, blanket, paint tote, panties and cord is because those items came into direct contact with the parents' clothing, which should not (and to hear them tell it, COULD not) have happened if they not involved.
Thanks for the answer, I forgot where I wrote and got lost with all the posts.
I guess we don`t know what fibers were found on her clothes, or if they were even searched. There should be some PR and JR fibers on JB whether they are innocent or not. Actually, shouldn`t there be PR touch DNA on the long johns, if she put them on her? The problem for me continues to be that I don`t know, from what I`ve read, what are the undisputed facts about fibers and are all the facts presented objectively (you can choose to present only R fibers for example). On a side note I was surprised at how weak the BP presentation was according to PMPT, little real evidence.