I am probably the only RDI who thinks it possible that a stun gun could have been used. I just can't rule it out, in view of the fact that a stun gun video was found in the home, and the Rs admitted it was theirs. It was in Spanish, which they pointed out, but you can watch it and still get a grasp of how to operate the stun gun. As we know, no stun gun was found. (Anyone check that golf bag? Search the Rs as they left? Search Aunty P?- didn't think so).
But it seems suspicious that the Rs would admit they owned a stun gun video, but deny owning the actual stun gun. Obviously, they WANT it to be thought that a stun gun was used, yet refused to allow exhumation to test the tissue while it was still early enough to tell.
If a stun gun was used, I can only envision two scenarios. One, that it was used after she was dead or unconscious to enhance the appearance of an intruder's botched kidnapping OR two, IF BR was somehow involved, possibly with JAR or DS, (which is the only way I think he could be involved) then they could have used it to subdue her. She did scream, and that could have been the reason why. If you look very closely, you can see a faint mark on her cheek, parallel to the mark we are all familiar with. It does not look like the abrasion we see, but it seems to be in the position that lines up like the pair of marks on her back. If the duct tape was in the way and prevented the abrasion, as we see on the part of her cheek NOT covered by the tape, then I thing we can assume that if a stun gun was used, it was after she was unconscious, because we know the tape was put on an unconscious JBR.
Of the two, I lean towards the first one, that if one was used, it was part of the staging.